feat(gulpfile): adjust for gulp 3.5.0 from tomchentw-boilerplate
feat(gulpfile): adjust for gulp 3.5.0 from tomchentw-boilerplate

* make coveralls upload presence in TRAVIS only
* change watch task to use new APIs

BREAKING CHANGE

watch task has changed to use new APIs from gulp 3.5.0 (but do same things)

tomchentw-deprecated/ng-fire-alarm,appleboy/ng-fire-alarm,tomchentw/ng-fire-alarm,appleboy/ng-fire-alarm,appleboy/ng-fire-alarm,tomchentw-deprecated/ng-fire-alarm,tomchentw/ng-fire-alarm