Rails 4.0 Travis setup.
Mention Rails 4 support in README.md.
[ci skip]
Merge pull request #47 from simi/rails4

Rails 4 travis support.
rvm rvmrc to .ruby-version
GoodBye Ruby 1.8.7
Ruby 1.9.2 is not supported by Rails 4
Fix for missing options on class level add_breadcrumbs method.