Fix I18n backend performance

From 250% slower to 25% faster :smile:
Use Ruby 1.8 hash syntax
Increase allowed speed difference
Separate unit and performance testing
Merge pull request #129 from lassebunk/fix-i18n-performance

Fix I18n backend performance. Fixes #128
Version bump to 2.0.5
Regenerate gemspec for version 2.0.5
Added German localization
Merge pull request #130 from widescape/GermanLocalization

Added German localization
Version bump to 2.0.6
Regenerate gemspec for version 2.0.6
Merge branch 'master' of github.com:rsl/stringex
Regenerate gemspec for version 2.0.6
 remove gemfile lock from version control
trying to trigger rebuilding travis
add test ensuring overriding String#to_ascii to just return self allows using String#to_url [and acts_as_url by extension] to return utf8 urls
Version bump to 2.0.7
Regenerate gemspec for version 2.0.7
add test ensuring overriding String#to_ascii to just return self allows using String#to_url [and acts_as_url by extension] to return utf8 urls for real this time not just the structure for tests but no test, heh
improve error handling for i18n load issues