Build does not fail when branch coverage is less than 100%

[Blackbaud-PaulCrowder]

Expected behavior

The Travis CI build should fail if the unit test code coverage stats for statements, branches, functions and lines are not all 100%

Actual behavior

The Travis CI build should succeeds if the unit test code coverage stats for statements is 100% but branches is less than 100%

Steps to reproduce

Get latest from master and run grunt build test. Open the index.html file in the coverage/ folder and notice that both autonumeric/ and error/ have branch coverage of less than 100%.

[Blackbaud-PaulCrowder]

lemurheavy/coveralls-public#31

One commenter mentioned switching to codecov.io.

[Blackbaud-BobbyEarl]

Testing implementation with Codecov via #454 worked well.

Current code coverage is lower than expected as they don't support "optional documentation" in Istanbul comments. https://github.com/codecov/support/issues/151

[Blackbaud-PatrickOFriel]

If this doesnt get address by codecov by May 16, we'll change our comments to fit their requirements

[Blackbaud-PatrickOFriel]

Changed our code coverage comments, waiting on codecov to release a fix which will respect /*istanbul ignore next */ with functions