Release 0.1.1

[ripienaar]

Hello,

I released version 0.1.1 today, since I last announced a release here much has changed.

• Support emitting a banner before running a command
• Cheat sheet style help for commands
• Shell scripts can be embedded in the yaml file for the exec type
• Support dry run mode in exec when BUILDER_DRY_RUN environment variable is set
• Support a choice of help template format
• Support Boolean flags
• Numerous documentation updates
• Numerous UX improvements by using our fork of Kingpin
• Adds non fatal helpers for registering commands

This brings this project to a reasonble stable state with most of the core feature set stable and well supported.