Merge pull request #1 from IfatChitin/master

Added a splash activity
Added button style, green color and changed current buttons styles.
Refactor: renamed login.xml to activity_login.xml
Added username and password controls to activity_login.xml
Added a "Remember me" checkbox to activity_login.xml
Added a new activity (dashboard) and the skeleton of the functionality that will start the new activity
Added a GridView to the dashboard activity with sample data.
The new class Item should be renamed.
Not final changes related to tabs and fragments, committed for a consultation