added slide menu and place holder fragments

Removed tabs after discussed with Felipe as the navigation drawer and the action bar tabs are not compatible. We can user the pagerslidingtabstrip or other custom tabs later.

References:
http://stackoverflow.com/questions/21129694/actionbar-and-actionbar-tab-and-navigation-drawer-android
http://stackoverflow.com/questions/16713530/android-navigation-drawer-over-the-tabs