Login Screen

Closes #120 and Closes #121

- Updates login layout to include title, progress and bg image
- Adds styles for bold Roboto text
- Adds and implements "no action bar" styles
- Animates views on login screen
- Adds a wideimageview for the bg image
- Marks some activities as not having an action bar
Merge pull request #135 from steffanc/121-login-screen

Login Screen