Catch gulp plugins errors

[Bogdaan]

While i use gulp watch (with browsersync) and make a mistake in jade template - this will break watch cycle.
So you have to restart gulp.

Posible solution:

1. for less:

.pipe($.less().on('error', console.log))

2. for jade:

.pipe(
      $.if(/\.jade$/, $.jade({
        pretty: !RELEASE,
        locals: {
          pkgs: pkgs,
          googleAnalyticsID: GOOGLE_ANALYTICS_ID
        }
      }).on('error', console.log)
    ))

Same question: gulpjs/gulp#71