gulp/watch does not pick up the correct globs for app files

    Basically gulp.watch(["app" + "**/*"],...) is incorrect.
    gulp.watch(["app" + "/**/*"]) is. Or a bit more general
    gulp.watch("[path.join("app","**/*")],...") should also work
Merge pull request #55 from ngbinh/master

gulp/watch does not pick up the correct globs for app files