Reload I18n before each test case in mailer spec.
Reload I18n before each test case in mailer spec.

When mailer spec is run alone everything is fine, but if it's run along
with the whole test suit (via rake spec) looks like I18n is initialized
earlier and extending I18n.load_path in Travis::Mailer.setup method
doesn't take effect and mailer spec fails with 'translation missing'
errors. I18n.reload! fixes the issue.

travis-ci/travis-core,kidaa/travis-core,developerfm/travis-core,final-ci/travis-core,kidaa/travis-core,developerfm/travis-core,Tiger66639/travis-core,final-ci/travis-core,travis-repos/travis-core,jantman/travis-core,final-ci/travis-core,GistIcon/travis-core,Tiger66639/travis-core,GistIcon/travis-core,GistIcon/travis-core,developerfm/travis-core,travis-repos/travis-core,travis-ci/travis-core,kidaa/travis-core,travis-ci/travis-core,Tiger66639/travis-core,jantman/travis-core