Added platform to gem specification to avoid bug in rubygems 0.9.5 - see http://www.dcmanges.com/blog/rubygems-0-9-5-platform-bug and http://rubygems.org/read/chapter/20#platform.
Added platform to gem specification to avoid bug in rubygems 0.9.5 - see http://www.dcmanges.com/blog/rubygems-0-9-5-platform-bug and http://rubygems.org/read/chapter/20#platform.

travis-repos/mocha,alloy/mocha,10io/mocha