Add usersWithRole to the Auth class in auth.coffee

This allows scripts to list out all users with a specific role by calling robot.auth.usersWithRole
Increase the spacing between Auth methods in auth.coffee
Merge pull request #566 from jhubert/add-usersWithRole-to-auth

Add usersWithRole to the Auth class in auth.coffee
Merge remote-tracking branch 'upstream/master'
Remove trailing whitespace from scripting.md
Change badgers to badger so that the example makes sense
Add a patterns doc for common approaches
Add a patterns reference to the main README
update syntax in contributing.md
my_method -> myMethod
Merge pull request #569 from jhubert/add-patterns-doc

Add a patterns.md file to the documentation
Merge remote-tracking branch 'upstream/master'
minor typos and grammar

changed the final commit line to use 'commit' rather than 'ci' to be consistent with the first one
Merge pull request #572 from pseudomuto/patch-1

fixing some minor typos and grammar
Merge remote-tracking branch 'upstream/master'