Added support of PIXEL_SIZE_ON_SCREEN range mode in mp driver
BUG-FIX: the minimum LOD option is now applied correctly when engine mp is used.
Fixed a typo in a comment
Merge branch 'master' of https://github.com/gwaldron/osgearth
Removed "fix" for the min LOD option.
Commit untracked fiels for merging
Merge remote-tracking branch 'hpicgs/master'
Merge remote-tracking branch 'origin/master'
Removed unnecessary backup file
Merge pull request #482 from hpicgs/master

Option to activate PIXEL_SIZE_ON_SCREEN range mode for the mp driver + Fix for min LOD option