Clear the global PGL on dispose().
Added strokeWeight() as related to stroke() ref page, per request on processing/processing-web#293
Merge pull request #2279 from jdf/master

Clear the global PGL on dispose().
set prevTexImage in setLastTexIndex, fix #2205
same changes related to #2259
fix #2171
fix #1900
some commented code to handle #2296
fix #2193
don't set pgl to null for offscreen surfaces.
update to jogl 2.1.3
update to lwjgl 2.9.1