update videos, styles for video container

Conflicts:
	app/assets/javascripts/templates/help_modal.html.haml
interactive legend in help modal

Conflicts:
	app/assets/javascripts/angular/directives/legendMatrix.js.coffee
	app/assets/javascripts/templates/legend_matrix.html.haml
	app/assets/stylesheets/page.css.sass
	app/views/page/index.html.haml