Changing rspec dependency to 3.0. Updating to expect syntax.
Rspec code style proposal.
Adding mini_portile as in nokogiri.
Correcting gem name.
Chaging sysenv name for using system libraries.
Adding a help and cleaning ports build directory (like nokogiri).
Fixing heroku bug when cleaning up.
Removing cleaning files at the end of build.
Removing clean option from help as it's still an issue on heroku builds.
Merge branch 'rspec3'