Playing with fog.
Reworked fog to not be a TerrainEffect so you can stick it anywhere

Removed Fog from the osgearth_terraineffects example.
Modifying the density of the fog based on the camera height.
Making tile size reasonable when adding elevation in osgearth_package_qt
Update JSWrappers.cpp

API change
Merge pull request #445 from remoe/patch-6

Compile error fix: JSWrappers.cpp
Merge branch 'master' of git://github.com/gwaldron/osgearth