fix servo #472: rust-azure target doesn't depend on libskia.a
Add some high level bindings
Merge pull request #23 from sonwow/hl-bindings

Add some high level bindings
Merge pull request #22 from aydinkim/master

fix servo #472
Delete unused variable.
Enable debugging output.
Add dependencies on layers and opengles.
Implement TextureManager.
Remove spurious debugging.
Initialize GL context with a size.
Remove unused import.