fix(progressCircular): SVG transforms for indeterminate mode and performance improvements

[crisbeto]

• Avoids unnecessary digest cycles during the indeterminate animation by using setInterval, instead of $interval.
• Avoids creating multiple Date objects by using the performance API and the timestamp from $$rAF.
• Avoids unnecessary DOM manipulation and layout by only setting the element dimensions when the diameter changes.
• Avoids unnecessary layout by pulling the SVG element out of the flow.
• Fixes wobble in indeterminate animation on IE by switching to animating the SVG transform attribute. Below is an example of the wobble (left is CSS rotation, right is SVG):
  

[devversion]

Just curious, you said, that you wan't to stop the digests for $interval. I would rather use

$interval(fn, delay, 0, false);

[crisbeto]

Good point, I'll put it back in.