Add option NTA_COV_ENABLED for test coverage
Using STREQUAL
Make $TRAVIS_OS_NAME defaults to linux
Report test coverage to http://coveralls.io under linux
Add Coverage Status to README
Merge pull request #147 from utensil/146-coveralls

Setting up coveralls.io for coverage reporting
Updating coverge badge to master branch
Merge pull request #149 from rhyolight/cover-badge-update

Updating coverge badge to master branch