[geometry] Replace 'By' with 'This'

All,

during the discussion with mozilla, people also thought that the 'by'
methods are very confusing (ie translateBy, scaleBy, rotateFromVectorBy)
Roc suggested that we should replace it with 'This' so it's more clear that
the matrix operation is done in place.

Thoughts?

Received on Monday, 9 June 2014 22:52:02 UTC