Left handed navbar during landscape mode

This patch allows for the navbar to be moved to the left side of the
screen during landscape mode. Left handed people are more used to this
option.

This patch must go with another patch that changes
packages/apps/Settings

Screenshot: http://i.imgur.com/jWqJcEV.png

Change-Id: Ic95e3fda1f55efd2ec908c8d7226e638ec0ab80a

Expanded Desktop : Fix Left handed navbar during landscape mode

from http://review.cyanogenmod.org/#/c/57454
when you enable expanded desktop and left handed navbar.
you need to swipe from right edge to show navbar.
but this patch will change to swipe from left edge to show navbar.
Video avalible at http://youtu.be/rUy14LQj9iE

Patchset2 : change tab to whitespace
Patchset3 : remove \r after @override in PhoneWindowManager.java
Patchset4 : Update commit message
Patchset5 : Address code formating comments
Patchset6 : Whitespace

Altaf-Mahdi
Add left gesture for edge gesture service

Change-Id: I65a15c6f5e662e429a818484de6b71e81c7ae713