! fix test unit dependency error
. version bump
- Gemfile.lock to satisfy travis
- remove appraisal gemfiles and ignore them
. more open dependency on rails 4 for tests
. rbx compatibility
+ test coverage for 2.1, 2.0
. fix the travis bundle install bug hackishly
. allow failures for 2.1.0 while bundler has issues
. deprecate test coverage for 1.9.2
! removed files
. version bump
Updating matcher to support testing class callbacks
Merge branch 'v0.2.1'

Conflicts:
	Gemfile.lock
Refactoring method calls
Also check for the methods existence
Adding basic callback_object tests
Updating specs
Updating docs
Updating docs