Work on getting the MBTiles driver up to date.
Merge branch 'master' of github.com:gwaldron/osgearth
Fixed mosaicing issue in MBTiles driver by return an empty image that is the same size as the other images.
Fix: PlaceNode setText() not applying text encoding style
Merge pull request #322 from WalkingCat/master

Fix: PlaceNode setText() not applying text encoding style
Adding javascript support for iOS based on the JavaScriptCore engine.
Merge branch 'master' of https://github.com/gwaldron/osgearth

Conflicts:
	CMakeLists.txt
texture blending, it's back.
Merge branch 'master' of github.com:gwaldron/osgearth
Fix removeShader bug in VP; cleaned up DetailTexture and ContourMap to properly release units
Removed old 'lodblending' references in the MP driver code
Updated osgEarthViewerIOS project to reflect recent changes.
Merge branch 'master' of https://github.com/gwaldron/osgearth
Added missing JavaScriptCore CMake module.
Update ios.rst

Updated iOS docs regarding javascript support.
Update ios.rst

Fixed typo
FeatureModelGraph: add the ability to exclude style-expression features by returning a null style
Merge branch 'master' of github.com:gwaldron/osgearth
Hooked back up --vert option in osgearth_imageoverlay and the ImageOverlayEditor.
Merge branch 'master' of github.com:gwaldron/osgearth