check for `apipie_footer` content before add new content
replace `provide` with `content_for`
Support for localized API documentation
Added localization documentation
Merge pull request #232 from mbacovsky/localized_apidoc_support

Support for localized API documentation
Deprecate rails 3.0

We can't support that forever.
Merge pull request #241 from iNecas/deprecate-rails-30

Deprecate rails 3.0
Merge pull request #213 from leschenko/footer_doubling

Copyright appear multiple times in docs generated via rake task (`apipie:static`)
Tests for middleware.

Fix in `lib/apipie/extractor/recorder.rb` for inproper return value in call method if recording is disabled.