Merge pull request #1 from sharespost/master

Add Layer#custom_recipes and Layer#update_custom_recipes.
Merge pull request #2 from sharespost/master

Add Cli#custom_recipes.
Bump to 0.4.2
Merge pull request #3 from sharespost/master

Join Cli#layers with space instead of comma.
Bump to 0.4.3
Fix build in ruby 1.9.3
Switch to developing in ruby 2.1.0
Switch to realistic mocking setup
Bump to 0.5.0
Remove stray code duplication
Stop asking opsworks about nil user arns