Total Comments accumulator fixed.

Display activities comment count metric #34
Update GdeTrackingApp.js
Update polymerDetails.css

Shadow effect for the GDE images.
Update start.html

GDE picture shadow effect
Update index.html

GDE's and Googler's skips menu until more options are available.
Allow for time-bounded reports #11

* Loads current month on start by default.
* Show's selected time range.
Allow for time-bounded reports #11

* Show current month data on load by default.
* Show active time filter.
Merge pull request #3 from maiera/feature/material_design

Feature/material design