… clean up Mongoid adapter and specs
…n behavior for ActiveRecord and DataMapper. Previously, CanCan::ModelAdditions had to be included in each and every Mongoid document separately. Also removed manual include of CanCan::ModelAdditions from Mongoid documents in Mongoid adapter specs.
…tests if this is actually needed
…_ADAPTER env variable
…R environment variable for choosing which one to run
This broke some of the mongoid tests and I don't know how to fix them. Both packages define Symbol#in, and when you load them both things don't behave properly. Hopefully someone more versed in mongoid can rewrite the spec to not depend on the Symbol extensions.