Update SevenSeg.h
Update SevenSeg.h

cleaning code: common pin fix
Update SevenSeg.h
Update UseSevenSeg.ino
Update SevenSeg.h
Update SevenSeg.h
Update SevenSeg.h
Update UseSevenSeg.ino
Update SevenSeg.h
Update UseSevenSeg.ino
Update UseSevenSeg.ino
Update UseSevenSeg.ino
Update SevenSeg.h

New version
- arbitrary pin support
- hexadecimal support
- simple error writing support
- common cathode / common anode feature rewritten
- various smaller code optimizations
Merge pull request #25 from remernl/master