Update extension/src/starling/display/Graphics.as

Optimized the number of calls to deg2rad().
Updated to upstream commit 434e09b3edc3f8c7cbda3312f5485ae9f896c3fc
Strokes can now use degenerates for moveTo(..) to avoid generation of extra vertex batches for segmented lines
Made degenerates the default for moveTo(..) and cleaned up implementation for stroke fill
Merge pull request #46 from jarrodmoldrich/degenerates_for_strokes

Using degenerates to reduce extra vertex buffers cause by moveTo(...)