Prevent interpolation for load matrix/current pos.

load matrix (green box w/current position highlighted) no longer
has blurring/interpolation. Courtesy of
http://stackoverflow.com/questions/7615009/disable-interpolation-when-scaling-a-canvas/11751817#comment16376313_11751817
Merge pull request #3 from rameshvs/master

Prevent interpolation for load matrix/current pos.