Merge pull request #10 from numenta/master

Merge numenta:master@HEAD
Merge pull request #19 from numenta/master

Pull upstream
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