Test with_locale
Test that block gets called
Test interface instead of implementation
Separate the two backends into their own modules
Update tests for new backend

Translations are loaded in setup. Fewer tests with more assertions to
save setup overhead.
Test Ruby 2.0.0
Merge pull request #105 from lassebunk/test-ruby-2.0

Test Ruby 2.0.0
Don't think we need this attr_writer
Merge pull request #104 from lassebunk/separate-localization-backends

Separate localization backends