Provide ruby methods to apply SVG transformations
Added simple support for SVG Path element
Add an example for transformations
Add tests for transformations
Compatibility fix for transforms

Resolve conflict between transforms given as attributes during
initialization and transforms given using ruby methods
More specs, some doc and fixes
Add support for definitions and gradients

Added a new internal class SVGTagWithParent, used to carry and propagate a reference to the main image
Merge pull request #1 from papylhomme/master

Added support for Path and transformations