Integrate and style homebrewn contact form.

Add:
	static/(css/contact.sass, js/contact.js)
		-styling and javascript for templates/contact.html.

	app.py
		-necessary routes for contact page.

	py/utils.py
		-add send_email() function, which currently only stores emails in a
		mongo collection because we don't have an SMTP server to send them.

Mod:
	static/css/(_index > index, app).sass
		-remove import of _index.sass from app.sass, because index styling isn't
		necessary for any non-index pages.
		-move _index.sass to index.sass, as it's now an individual stylesheet.
Merge branch 'contact_page'

Conflicts:
	static/css/app.css