Added support for the PS4 controller via Bluetooth
Merge branch 'PS4BT'
Updated documentation typo
Updated comment
Added information about the PS4 library
Typos, whitespace and some other cleanup stuff
Renamed KEYPAD to TOUCHPAD
Now onInit() works with the PS4 library as well
Handle DPAD properly on the PS4 controller

The DPAD got separate values for each case - see: DPADEnum in PS4BT.h.
Fixed include
Added information about powered hub to FAQ
Remote name buffer should be a char array
Added support for the PS4 controller via USB

Also improved the PS4BT library
Fixed conflict between PS3 and PS4 libraries
Forgot return in connected()
Added links to blog posts
Updated some comments and some other minor things
Updated some more comments
Can now read the IMU and touchpad values of the PS4 controller via Bluetooth as well

Thanks to Frank Zhao - see: http://eleccelerator.com/wiki/index.php?title=DualShock_4#0x11
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