STMPE811: working reading, writing and interrupt

- Slightly changed rading and writing routines.
- Added delay after reset of STMPE811 in initialization code.
- STMPE811 "interrupt service routine"
- Comments, formatting etc.
- Another commit with unfinished driver.
Merge pull request #48 from resset/master

STMPE811: working reading, writing and interrupt
STMPE811: attempt to use FIFO

Very early version of using FIFO threshold interrupt.
Merge pull request #49 from resset/master

STMPE811: attempt to use FIFO
STMPE811 - initial
board file fix
STMPE811 getpin_pressed() -> getpin_irq()
STMPE811 cleanup & readme
STMPE811 tweaks
GPIO interface-related fixes
Adding acquire_bus() and release_bus()
so that orientation setting commands are
not ignored.
GPIO interface-related fixes: Cleanup