- findContours() fixed
- bitwiseAnd(), bitwiseNot(), bitwiseXor() may accept mask as the last argument since now
oops, bitwiseNot() hotfix
HoughCircles added
Merge pull request #187 from madshall/master

fixes to Matrix.cc: findContours(), bitwiseAnd(), bitwiseNot(), bitwiseXor(); houghCircles() has been added;