SystemUI: Clear all in recent apps and memory usage in recent apps

Clear all on recent apps original code from PA D4rKn3sSyS

Screenshot is here :
https://twitter.com/htchoi1995/status/290835833144086528

Signed-off-by: htchoi1995 <htchoi1995@gmail.com>
SystemUI: Change clear all button position
SystemUI: Don't kill foreground task
SystemUI: Redesign memory usage in recent apps

Signed-off-by: htchoi1995 <htchoi1995@gmail.com>
SystemUI: carbon does not have isXlarge method
Traffic: traffic stats change
Merge remote-tracking branch 'tb/jellybean' into jellybean
Merge branch 'jellybean' of https://github.com/ThinkingBridge/platform_frameworks_base into jellybean