correct indentation
default value as a proc without argument
Update README.md

Explains better how to use the :using parameter.
Add a Rails 4 Gemfile and point the main Gemfile to the 4.1 release.
Tidy up gemspec a bit.
Merge pull request #46 from fabianoarruda/master

Update README.md
Update travis token
Merge pull request #37 from krzysiekherod/master

default value as a proc without argument
Add the `:in` option.

Closes #27 and #33.
:scissors:
Merge pull request #51 from plataformatec/lm-in-option

Add the `:in` option.
Bump Action Pack and Active Support dependencies.
Update copyright year [ci skip]
Update dependencies, update travis to test against Ruby 2.1.1
Add initial changelog. Closes #47 [ci skip]
Refactor is_a? conditionals with case
Reindent case statement