Add deprecation messages into FilterManager

According to https://github.com/rspec/rspec-core/issues/1373 RSpec 2.99 should warn about changes in RSpec 3.

PS. I think I should also work on arguments in FilterManager(#include, #include_only, #exclude, #exclude_only, etc). I don't like idea to accept any number of arguments and use only last. It makes  an unclear interface.

/cc @JonRowe , @myronmarston