add in license comment at the start of each file

Conflicts:

	IdeaPress/css/default.css
	IdeaPress/css/themes/custom.dark.css
	IdeaPress/css/themes/custom.light.css
	IdeaPress/css/themes/custom.orange.css
	IdeaPress/modules/wordpressCom/css/wpcom.module.css
	IdeaPress/modules/wordpressCom/css/wpcom.module.detail.css