receiver structure finished
core part finished

remained:
- more than 1 thread for decode process
- color card generator
- test code part
readme
touch get color

test，coordinate transformation has some problem
ｐａｓｓ！

the receiver now can run successfully without any runtime errors if
properly operated.
some test update
update transform
receiver finished
Merge pull request #3 from tankiJong/receiver

Receiver