Revert back to textmate formatter

This commit reverts pull request #49, fixes issues #68, #52

RSpec::Mate::Formatters::TextMateFormatter doesn't work with Bundler because it tries to load 'rspec/core/formatters/html_formatter' early before Bundler.setup, while there is no rspec libraries on the load_path yet.

Also, there are some issues with RSpec::Mate::Formatters::TextMateFormatter's output, like formats, links, while 'textmate' formatter works fine with textmate.