add vcproj for vs2008
use sort algorithm  in c. optimize 80ms to 50ms
add
remove unused function.
Merge branch 'master' of https://github.com/siryang/toolkits into siryang_branch

Conflicts:
	dither/example/test_dither/dither_shuffling.cpp
Merge pull request #1 from siryang/siryang_branch

Siryang branch