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'.

EDIT:

The moment.min.js file in js-deps is Not a Contribution (as I did not write it). It is licensed under the MIT license copyright Tim Wood, Iskren Chernev, Moment.js contributors The license info is also contained in the actual file as a comment.

Link to License: https://github.com/moment/moment/blob/develop/LICENSE
This is the wrong place for this, and the library defaults to english without setting locale explicitly, so I'd prefer to leave it out for now.