Revert "Add stealing and manual GL context creation"

This reverts commit af5d2e6b5c3c2caab7f3de16648e3357cfe00df4.

Conflicts:
	azure_hl.rs
Upgrade Rust.
Merge pull request #55 from metajack/uprust

Upgrade Rust.
Need to use -std=gnu++0x for OS X 10.9. Also removed unused .mm source from
the build.
Stop using shared GL contexts and move to native OS surface sharing