Add zoom
Implement zoom for brushes, various zoom fixes, remove canvasBorder.
Fixes to zoom for groups and brushes.
Merge branch 'master' of https://github.com/kangax/fabric.js

Conflicts:
	dist/all.js
	dist/all.require.js
	src/brushes/circle_brush.class.js
	src/brushes/spray_brush.class.js
	src/canvas.class.js
	src/mixins/canvas_events.mixin.js
	src/mixins/object_interactivity.mixin.js
	src/shapes/group.class.js
	src/shapes/image.class.js
	src/shapes/object.class.js
	src/util/misc.js
Merge branch 'master' of https://github.com/kangax/fabric.js

Conflicts:
	dist/all.require.js
Fixed control and group selection rendering
Constrain rounded rect radii to half the width & height.
Optimize for common case of radius 0.
Merge pull request #1312 from rodovich/round-rect-radii

Constrain rounded rect radii to half the width & height.
Perform imported SVG rotations in degrees, per the SVG spec.

http://www.w3.org/TR/SVG11/coords.html#TransformAttribute
Be able to parse numbers with no digits before the decimal point.

Per the [SVG spec](http://www.w3.org/TR/SVG11/types.html#DataTypeNumber), non-integer number values do not necessarily have any digits before the decimal point.
Be able to parse viewbox numbers with no digits before the decimal.
Update unit tests to use degrees for imported SVG rotations.
Add test for parsing numbers with no digits before the decimal point.
Use a cubic bezier approximation for rounded rectangle corners.

According to the SVG spec these corners are supposed to be elliptical arcs.  HTML canvas does not have methods for elliptical arcs, but a cubic approximation can get within 0.02%.

Using the "magic number" from http://itc.ktu.lt/itc354/Riskus354.pdf.
Merge pull request #1316 from rodovich/degree-rotation

Perform imported SVG rotations in degrees, per the SVG spec.
Merge pull request #1317 from rodovich/leading-decimal

Be able to parse numbers with no digits before the decimal point.
Merge pull request #1314 from rodovich/round-rect-arcs

Use a cubic bezier approximation for rounded rectangle corners.
Add coverage to .gitignore
Add support for transparent value in fabric.Color