Synchronize initialization of ContributionListing singleton
Updated related references for frameCount and frameRate, per processing/processing-docs#29
Merge pull request #2735 from federicobond/synchronized-singleton

Synchronize initialization of ContributionListing singleton
Added several related references for textSize(), per processing/processing-docs#29
Merge branch 'master' of github.com:processing/processing
Added several related references to PFont and text(), per processing/processing-docs#29