Removed unnecessary check

Removed unnecessary check: (0<=cd), where "cd" is an unsigned int. 0
Will always be the smallest number that an unsigned int can be.
Whoops

Removed unnecessary parenthesis
Update NKDCode128Barcode.m

Check digit calculation is a modulo 103 checksum, but _encodeNumberPair only has switch-case from 0 to 99.
Check character encoding fails when checksum value is 100, 101 or 102.

Fix : Added bar/space pattern for values 100, 101 and 102
Merge pull request #10 from jasonkhonm/patch-1

Update NKDCode128Barcode.m
Merge pull request #7 from teh1ghool/master

Removed unnecessary check
more notes
github readme style
add contributors
add link back to original
Merging upstream