Update quadtree_spatial_provider.cc

Fixed a logical error that was causing some bad iterators.
Merge pull request #608 from rcythr/develop

Update quadtree_spatial_provider.cc
Merge remote-tracking branch 'anh/develop' into develop
Merge branch 'develop' into swged
Add test runners
Commented out test for now
Build for vc12
Added ability to use test data
test terrai
Moved library code into the terrain visitor
Added test to get height
Fixed header check
Uncommented header tests which now pass
The filtermap owns all filters and expresses that now by holding them via unique_ptr
Cleaned up potential leaks with layer loading
Added terrain editor view for .trn files
Added initial construction layer tree
Now shows map options dialog with data
Changed to pub 14 version of this terrain
Now shows flora options