add new events page.
refactory frontend resource process.

- copy necessary files from bower_componets to frontend/public/vendor.
- move all files in frontend/public/vendor/ to frontend/public/js
- don't concat js provided by template, bower_components to vendor.js.
full calendar view with some hard-coded events.

- add /events.json to provide evenet source in json format.
- write metadata of events hardcode for testing.
Merge branch 'feature/events' into feature/blogrss

Conflicts:
	frontend/public/js/vendor.js
	gulpfile.ls