added coveralls
Merge pull request #25 from bsiddiqui/add-coveralls

added coveralls
added coveralls badge to readme
Merge pull request #26 from bsiddiqui/add-coveralls-badge

added coveralls badge to readme
added proper coveralls badge
Merge pull request #27 from bsiddiqui/update-badge

added proper coveralls badge
added simplecov and updated readme