fixes null pointer exceptions

.github/issue_template.md

@@ -0,0 +1,38 @@
+Please do not submit support requests or "How to" questions here. Instead, please use channels like [StackOverflow](http://stackoverflow.com/) or the [Ionic forum](https://forum.ionicframework.com)
+
+For issues or feature requests related to the code **in this repository** file a Github issue and provide as much details as possible
+
+**Bug or feature request**
+
+[ ] I'm reporting a reproducible issue with the code
+[ ] I'm reporting a feature request
+
+**Describe the Bug of feature request**
+
+A clear and concise description of what the bug or feature request is
+
+**Expected Behavior**
+
+A clear and concise description of what you expected to happen
+
+**Plugin version, OS, devices, etc**
+
+Please provide information about the plugin version, OS, devices etc. where you faced your issue
+
+**Sample repo**
+
+A sample repo will dramatically decrease the time needed for this issue to be fixed, if you could, please provide one in order to reproduce the problem
+
+Alternatively, provide a link to the source code of your app
+
+**Additional Context**
+
+List any other information that is relevant to your issue. Stack traces, related issues, suggestions on how to fix, Stack Overflow links, forum links, screenshots, OS if applicable, etc.
+
+**Important note**
+
+Unfortunately since this is a project done in spare time, support requests or "How to" questions will be closed without any further comments
+
+If we consider your issue to not be well documented, it will be closed without further comments too
+
+Thx you in advance for your understanding

.gitignore

@@ -26,4 +26,9 @@ gen/
 build/
 
 local.properties
-proguard/
+proguard/
+
+.idea
+*.iml
+/nbproject/private/
+nbproject

CHANGELOG.md

@@ -0,0 +1,77 @@
+<a name="2.2.0"></a>
+# [2.2.0](https://github.com/jeduan/cordova-plugin-facebook4/releases/tag/v2.2.0)
+
+## Features
+
+* **iOS:** Update Facebook iOS SDK v4.34.0 ([74bccb1](https://github.com/jeduan/cordova-plugin-facebook4/commit/74bccb1a4f8938024002d0f4e681b9a56b1d7f43) | [Facebook changelog](https://developers.facebook.com/docs/ios/change-log-4x))
+
+<a name="2.1.0"></a>
+# [2.1.0](https://github.com/jeduan/cordova-plugin-facebook4/releases/tag/v2.1.0)
+
+## Features
+
+* **iOS:** Update of the Facebook SDK v4.33.0 for iOS 11 ([#653](https://github.com/jeduan/cordova-plugin-facebook4/issues/653))
+
+<a name="2.0.1"></a>
+# [2.0.1](https://github.com/jeduan/cordova-plugin-facebook4/releases/tag/v2.0.1)
+
+## Bug fixes
+
+* **Android:** Fix null pointer exception leading to app crashing after a second login (flow example: login -> graphApi -> logout -> login -> crash) ([#568](https://github.com/jeduan/cordova-plugin-facebook4/issues/568))
+
+<a name="2.0.0"></a>
+# [2.0.0](https://github.com/jeduan/cordova-plugin-facebook4/releases/tag/v2.0.0)
+
+**Breaking change:** As of February 5, 2018, Facebook doesn't support anymore App Invites, therefore these methods have been removed.
+
+This version introduce also a new optional variable for the Android installation.
+
+## Features
+
+* **iOS:** App Invites support removed ([#645](https://github.com/jeduan/cordova-plugin-facebook4/issues/645))
+
+* **Android:** Add optional installation variable `ANDROID_SDK_VERSION` ([#550](https://github.com/jeduan/cordova-plugin-facebook4/issues/550))([#646](https://github.com/jeduan/cordova-plugin-facebook4/pull/646))
+
+### Side note
+
+I did consider removing the methods for App Invites as a breaking change, even if these weren't already supported from Facebook since months.
+
+I followed the semantic versioning idea the Ionic team recently published in their [blog](https://blog.ionicframework.com/ionic-semantic-versioning-release-schedule-and-lts/)
+
+@peterpeterparker
+
+<a name="1.10.1"></a>
+# [1.10.1](https://github.com/jeduan/cordova-plugin-facebook4/releases/tag/v1.10.1)
+
+v1.10.1 Fix an issue regarding the versioning (v1.10 was missing in plugin.xml)
+
+<a name="1.10.0"></a>
+# [1.10.0](https://github.com/jeduan/cordova-plugin-facebook4/releases/tag/v1.10.0)
+
+v1.10.0 introduces the last Facebook SDK for iOS
+
+## Features
+
+* **iOS:** Update of the Facebook SDK v4.31.1 for iOS 11 ([#631](https://github.com/jeduan/cordova-plugin-facebook4/issues/631)) ([#634](https://github.com/jeduan/cordova-plugin-facebook4/pull/634))
+
+* **Android:** Add a note in the README and Android Guide about the compatibility with cordova-android >= v7.0.0
+
+### Disclaimer 
+
+The introduction of the new Facebook SDK for iOS 11 add a new confirm modal to the login flow.
+
+This is the expected design flow defined by `Apple` which `Facebook` implemented. The `cordova-plugin-facebook4` can't modify this behavior (as far as I know, @peterpeterparker).
+
+#### iOS 11.3
+
+On iOS 11.3, the user won't have the choice anymore between using the Facebook App or using Email/Phone number for Facebook login process but will go straight to the "Facebook - Accept permissions" screen.
+
+Therefore, with this version, the user will still face only one modal during the login flow.
+
+#### iOS >= 11 < 11.3
+
+Because of the introduction of the new modal, the user might face two modals during the login flow. One asking him/her if he/she want to open Facebook and one again asking him/her as before if he/she want to open the Facebook App.
+
+About the subject, you could for example have a look to this [stackoverflow's post](https://stackoverflow.com/questions/45858774/ios-11-facebook-signin-is-showing-an-initial-system-alert/).
+
+This is improved with iOS 11.3.

CONTRIBUTING.md

@@ -10,7 +10,7 @@ These are just guidelines, not rules, use your best judgement and feel free to p
 
 Before creating a Github issue make sure you...
 
-- Check the [Troubleshooting Guide](TROUBLESHOOTING.md) for well known issues.
+- Check the [Troubleshooting Guide](./docs/TROUBLESHOOTING.md) for well known issues.
 - Search the [issues list](https://github.com/Wizcorp/phonegap-facebook-plugin/issues) for existing closed or still open issues
 - Create a Github issue