Design Improvements #178

- Cleaned up gradle config
- Replaced low density icons with Stock Holo Icons - https://developer.android.com/design/downloads/index.html#action-bar-icon-pack
- Replaced Existing Icons for comments/files/pictures with cleaner icons for both themes (to prevent dithering) - https://www.iconfinder.com/search/?q=iconset:eightyshades
https://www.iconfinder.com/search/?q=iconset:picol-vector
- Center Aligned Repository and User numbers