Timestamp improvements

Implements Issue #40 .
Added the moment.min.js file to the appropriate locations. Updated the
index.html to include some divs for the info to go.

Tests all passed (Identity and Pre Key Creation took a while though).

Updated some CSS to make things look a bit nicer.

Localization added via MomentJS (kept the filename as moment.min.js to keep the name short). Defaults to English, easy to switch with a language code such as 'fr' or 'de'.