Totally redid UI. 

- Moved logo to bottom of screen.
- Added custom views for all menus (calendar/main menu)
- Added back button to each activity.
- Added placeholder icons to menus.
- Added placeholder menu entry for gallery.
- Added text to image on main menu (shading is as long as text)
- Added bold, title and small text to styles.xml
- Programatically added colour to menu. Uses argb to maintain shading 
on press. Took colours from http://flatuicolors.com/
- Used dividerHeight to add gap between menu items. Used padding to 
move from sides.

TODO:

- Add toast for when there's no internet.
- Fix icons on menu.
- Fix lint warnings.
- Figure out why dateformat is using American format.