Revert "Convert specs to RSpec 2.14.8 syntax with Transpec"

This reverts commit 2c912e22347aa066e2c1c4a06fd67db89cbbc918.

Conflicts:
	spec/celluloid/pool_spec.rb
	spec/celluloid/stack_dump_spec.rb
Revert "Update rspec"

This reverts commit 1ff166f8ad08353f82ca50001cfdf852a7ec05bf.
Remove Bitdeli badge
CHANGES + version bump to 0.16.0.pre2
Bump version in Gemspec