Add variables for pamscale
Use variables instead of fixed string
Merge pull request #62 from yuutayamada/pamscale

Add variables for pamscale/pnmscale
temporary fix for pnm.
Using "pnmscale" by default.
ver bumps up.
adding 00changes.6.6.
s/6.6/6.6rc1/
updating 00readme.
reformatting info.
updating 00diff.
s/2012/2014/