Mongoid3 upgrade
Mongoid3 fixes
update to latest Mongoid3 (3e5de83818f4851bc082ac3cb5781dcf81c9cdb0)
Merge branch 'master' into mongoid3

Conflicts:
	lib/mongoid_optimistic_locking/lockable.rb
merged John Jingoro refactorings into "mongoid3" branch (Moped)
Merge branch 'master' into mongoid3
Merge branch 'master' into mongoid3
add mongoid 3.0.0rc as a gem requirement and fix a spec
remove 1.8.7 as a requirement for mongoid 3 on travis
Merge branch 'master' into mongoid3
publish new 0.0.3 version compatible with Mongoid3 after branch merge