[TagList] fixes for updating and saving tags.
[fonts][licence] local storage of Ubuntu and FontAwesome fonts. Applied MIT license to the project.

`icons.css.scss` is preparation for supporting use of the FontAwesome icon font in styles.

Also removed some commented-out code from `application.html.erb`.

Cleaned up the README, since it was being updated with license info.
user/session view refinement.

Include details on registering/signing-in with a remote service like Twitter.
[CSS] stylesheet for displaying tag lists (with tag icon).

Plus a slight fix to the calendar stylesheet to make sure the styles from `section#main` aren’t overriding the calendar styles.
[CalendarController] index and subscribe actions.

calendar#subscribe is basically a static view that explains how to use the ics format events list to subscribe to the calendar.

calendar#index auto-redirects to the calendar for the current month.
[views] Calendar and Events views inter-linked, cleaned up and refined.

Especially dealing with submenu items for navigating among the views.
[preflight][gem] go back to using the various code-metrics gems (dropping MetriKnit, for now). Updated the applicable gems.

Haven’t been working on MetriKnit, so it’s still unsatisfactory for now. So I’m reverting to using the various gems to generate individual code-metrics reports.