Implement progress event in phantomas module

[macbre]

Trigger progress event (with page.loadingProgress property being passed) when running via phantomas CommonJS module

ariya/phantomjs#11091

[macbre]

ariya/phantomjs#11176 would be even better approach :)

[macbre]

$ DEBUG=phantomas:progress phantomas --url http://google.pl --verbose 2>&1  | grep progress
18:57:10.759 Loading progress: 10%
18:57:10.759 Event progress emitted
Tue, 25 Feb 2014 18:57:10 GMT phantomas:progress 10%
18:57:11.059 Loading progress: 30%
18:57:11.059 Event progress emitted
Tue, 25 Feb 2014 18:57:11 GMT phantomas:progress 30%
18:57:11.159 Loading progress: 38%
18:57:11.159 Event progress emitted
Tue, 25 Feb 2014 18:57:11 GMT phantomas:progress 38%
18:57:11.259 Loading progress: 44%
18:57:11.259 Event progress emitted
Tue, 25 Feb 2014 18:57:11 GMT phantomas:progress 44%
18:57:11.359 Loading progress: 81%
18:57:11.359 Event progress emitted
Tue, 25 Feb 2014 18:57:11 GMT phantomas:progress 81%
18:57:11.459 Loading progress: 100%
18:57:11.459 Event progress emitted
Tue, 25 Feb 2014 18:57:11 GMT phantomas:progress 100%