Matching platform based on string was a terrible idea. This patch checks
for compatible gemspecs.
Added test for platform gemspecs
Refactor changes for finding gemspecs
renamed available_specs to available_gemspecs
Using a fake architecture and platform for tests
Added more documentation about gemspec selection heuristic
Merge pull request #8 from opscode/jdmundrawala/idonebad

Ask rubygems if the gemspec is supported on the current platform