Changed from assetDir to runDir, removed excess glPushAttrib
Removed deprecated functionality and moved to equivalent.
Merge branch '6.0.x' of github.com:BuildCraft/BuildCraft into 6.0.x
Merge pull request #1935 from adudney/6.0.x

Fixes GL Errors and changes more deprecated functionality to equivalent
Merge branch '6.0.x' into 6.1.x