Add favicon, Google analytics; update README.

Add:
	static/images/favicon.ico
		-add favicon.

	static/js/google_analytics.js
		-add Google Analytics.

	templates/layout.html
		-add some metadata for search-engine
		-link in favicon and Google analytics.
Mod:
	README.md
		-replace occurrences of "proj3-6-VSSD" with "tour-de-city"
		-update project URLs.