v0.5.0

• By default, any subject, it example block, before(:each), after(:each), and around that returns a promise will be executed asynchronously. Async is NOT yet supported for context level hooks. Async approach from < 0.4.3 will still work.
• Update to RSpec 3.1 (core is 3.1.7, expectations/support 3.1.2, mocks 3.1.3)
• Opal 0.9 compatibility
• A lot more aspects of RSpec should work now as 20+ Opal pull requests were completed from opal-rspec work
• Remove copy of source from opal-rspec git repo (and just rely on git submodule fetch)
• Rake task improvements:
• supports passing a test pattern (include and exclude) and FileLists besides 'spec/*_/__spec.rb
• colors, formatter, and additional requires can be supplied from the command line via the SPEC_OPTS environment variable
• Formatters:
• Fixed issues with RSpec's BaseTextFormatter and made ProgressFormatter the default when run via the Rake task
• Fix redundant messages with expectation fails
• Browser formatter now works w/ progress bar and has a 'Dump to console' link that will put a clickable stack trace for a failed example in the browser console
• JSON formatter supported
• Fixed issues with constants/example group naming
• Basic nodejs runner support
• A lot more matchers enabled
• PhantomJS 2.0 compatibility (also still compatible with 1.9.8). Thanks to @AOst. Closes out #42