add user greeting on MainActivity
remove commented out code in LoginActivity
use same FB session to retrieve user info rather than make new one
Merge pull request #32 from rpandey1234/master

Add greeting on MainActivity page and remove commented code
Can now add a logo to a picture.

Only logo right now is nike. Need to make it so logo selection is based
on company tag. Need to improve UI for logo placement and adjustment.
Merge branch 'master' of https://github.com/maplesyrup/maple-android