Fix a shader recompile
Added more transform caching to PerspectiveCamera
Add class name to logging
Fixed shader recompile in GridLines
Cleaned up LineVisual, Buffer classes
agg lines working again
fixes
flakify
Bugfixes
Fixed all visual examples
minor edit
Merge pull request #603 from lcampagn/transform-system-cache

Fix shader recompile issues
Adding new tutorials for writing visuals
more documentation
tutorial 2 is done
started 3
tutorial 3 is done
minor edits
Add two new tutorials
transform corrections