Merge pull request #1 from unapiedra/master

My proposed changes.
PointSetRegistration: Fixed earlier commit error.
used the code given by christoph.
some little fixes.
Affine and rigid works, but the affine demo has bad results!
small fixes
.
Merge branch 'master' of https://github.com/bauminator90/ComputerVision

Conflicts:
	PointSetRegistration.m
Reduce w to something smaller. Small fix in sigma.
normalise points.
Merge branch 'master' of github.com:unapiedra/ComputerVision

Conflicts:
	PointSetRegistration.m