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
Adding space to docs
Foramtting
Merge branch 'staging'
+ merging PR #4 and restoring rails 3 compatibility via one condition - its not nice, but nicer than keeping two versions of the gem
. version bump