issue #1859:fix compiling error of AssetsManager.cpp
issue #1859:fix compiling error of ScriptingCore.cpp
Grid setProjection2D fix

It doesn't multiply it by the CC_CONTENT_SCALE_FACTOR().
Not needed since it is CCDirector::getWinSizeInPixels() already has it
calculated
Merge pull request #2584 from smshuja/master

fixed #2179: pointQueryFirst returns invalid Shape when a shape is not found.
Update AUTHORS [ci skip]
Merge pull request #2578 from ricardoquesada/grid_projection_fix

Grid setProjection2D fix
Merge pull request #2574 from minggo/AssetsManager-asynchronization

Fix compiling error of AssetsManager project on windows
PivotJoint will now take 3 or 4 arguments like in html5