2.2.2 (07/15/2015)
Bugs fixed
* Fix uninitialized constant StringIO error in C extension
2.2.1 (07/13/2015)
Bugs fixed
* Aaron Lasseigne: Thanks for fixing my bad .travis.yml
* Kouhei Sutou: Numerous circular argument reference fixes, method redefined,
assigned but unused warnings, superclass mismatch warnings, etc.
* Fixed uninitialized variable when using C-ext.
* Fixed README require
* Fixed superclass mismatch in rbx when using C-ext.
* Lots of rubocop fixes, and added rubocop to travis
43a89b744d