Deprecate BaseMatcher spec helpers.

Current spec status: 259 examples, 129 failures, 10 pending in 0.06153
seconds. 3 deprecations found.
Update PassWithActualMatcher.

Current spec status: 258 examples, 114 failures, 9 pending in 0.07317
seconds. 3 deprecations found.
Update core matchers.

Current spec status: 254 examples, 77 failures, 5 pending in 0.07611
seconds. 3 deprecations found.
Update ConstructMatcher.

Current spec status: 253 examples, 54 failures, 4 pending in 0.07164
seconds. 3 deprecations found.
Update RSpec dependency to 3.0 release version.

Current spec status: 253 examples, 66 failures, 4 pending in 0.09016
seconds.