Merge pull request #515 from dphang/master

Issue 1559 and typo fix
Added toString(separator).
Change AssetErrorListener#error to have AssetDescriptor.

This provides access to the parameters of the asset that failed to load.
Fixed Node#remove() when parent is collapsed.
CHANGES

Changed AssetErrorListener#error to have AssetDescriptor to enable access to parameters of failed asset.
Merge remote-tracking branch 'origin/master'
Allow customizing framerate.
Reset touch state on pause
Ctrl+a to select all.
Fixed ctrl/cmd for Mac.
All dialog to clear focus.
Merge branch 'origin/master'
Fixed getFrameRate()