use RSpec.deprecate for expect {}.not_to raise_error(SpecificErrorClass)
smaller regex in expectation to support current and future deprecation warnings
use not_to instead of to_not in one spec
spec that not_to raise_error(SpecificErrorClass) is deprecated

This also removes deprecation warnings that were showing up in rspec's
own output running specs for rspec-expectations.
deprecate not_to raise_error(messsage)
explicitly enable :should syntax for mocks in cuke

Cuke was failing since we merged expect syntax for mocks into
rspec-mocks master.
clarify deprecation warnings for not_to raise_error(with, args)
Merge branch 'deprecate-not-to-raise-error-with-message'