Extract #run into awesome_spawn gem.
Clean up packaged gem by removing unneeded files.
Relax coveralls dependency.

Allow specs to pass if coveralls is removed manually.
Merge pull request #90 from Fryguy/clean_up_gemspec

Clean up gemspec
Merge pull request #86 from Fryguy/extract_run_into_awesome_spawn

Extract #run into awesome_spawn gem.
Loosen dependency on more_core_extensions