Merge pull request #3 from geek/master

Adding test
Merge pull request #4 from geek/master

Adding help formatting
Merge pull request #5 from geek/master

Format usage with columns
Update readme and add test
Merge branch 'master' of github.com:hapijs/bossy

Merging upstream
Fixing assert to work with multiple args
Return error instead of throwing
Change version and add myself to authors
Code coverage up to 100%
Support null defaults for boolean