GCI-37 - Welcome page Revamp

Ticket: http://issues.openmrs.org/browse/GCI-37
Melange task: https://www.google-melange.com/gci/task/view/google/gci2014/5668125081075712

This is my version of the Welcome page
It looks like this:
![welcome](https://cloud.githubusercontent.com/assets/5406399/5528752/e2f45bfe-8a1c-11e4-9e33-8f84e93553bf.png)