fix index matcher for mongoid 4
Add different versions of mongoid to .travis.yml
made mongoid 4 specs pass, had to remove a bunch of stuff from spec and fix inclusion validator matcher
Removed specs:
Paranoia
Versioning
Multi Parameter Attributes
Mass assignment
Merge branch 'fix-index' of github.com:glebtv/mongoid-rspec into glebtv-fix-index

Conflicts:
	.travis.yml
	lib/matchers/indexes.rb