Update README.md

Added info at beginning stating what will be done and that nothing has been done yet.
Update README.md
Update README.md
updated for current teensyduino 1.20 RC2
new start/stop interface
uses dynamic DMA channel allocation
uses dynamic interrupt vector table in RAM
uses SPI transactions
Update README.md
Update README.md

Added discussion thread link
Delete README.md~

Removed README.md~ backup file
modified ChipSelect.h to work with new DmaSpi
Update ChipSelect.h

removed debug messages
Update DMASpi_example1.ino

The example sketch now also demonstrates the use of the ActiveLowChipSelect class.
fixed duplicate headers
fixed includes
updated readme to mention example
Changed usage of SPI Transactions. No more "idle" transaction
updated example instructions
Update DmaSpi.h

Fixed SPI include ("SPI.h" to <SPI.h>)
fixed includes
updated readme
Merge branch 'teensyduino_1.20_RC2' of https://github.com/crteensy/DmaSpi into teensyduino_1.20_RC2

Conflicts:
	DmaSpi.h
fixed includes (again....wtf)