[coveralls] setup coveralls front-end test coverage tracking
[travis, coveralls] send coverage data only on non-minified build
Merge branch 'develop' into coveralls
Merge branch 'develop' into coveralls

Conflicts:
	src/main/webapp/gulpfile.js
[gulp] fix gulp test task; (call cb())
Merge branch 'develop' into coveralls
Merge branch 'develop' into coveralls
Merge branch 'develop' into coveralls
[travis] fix test script error code returning
Merge branch 'develop' into coveralls
Merge branch 'coveralls' into develop