Improvements and updates from Bullet Train#194

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andrewculver wants to merge 15 commits intomasterfrom bullet-train

+63-14

Commits on Dec 21, 2017

Allow Bullet Train to add custom values for Stripe attributes on subscriptions.
andrewculver
committed
Merge branch 'bullet-train' of github.com:andrewculver/koudoku into bullet-train
andrewculver
committed
Adding more options for how to specify billing details on customer record.
andrewculver
committed

Commits on Apr 17, 2018

Properly handle invalid cards when changing plans.
andrewculver
committed

Commits on Jul 3, 2018

Fixing error handling when charge fails immediately.
andrewculver
committed

Commits on Oct 3, 2018

Fix free trials.
andrewculver
committed