Move INSTALLED_APPS before impl_settings import

This is necessary so that impl_settings can reference
INSTALLED_APPS, ie. INSTALLED_APPS += ('<appname>',)
Add geomanagers to polygon models
Add polygons urls to otm when app is installed
Expose the tilecache polygon layer through settings
modify singleClick event when polygons are showing
Add url and view to search for polygon data
Add polygon edit / modify functionality
Support deleting species from polygons
Merge pull request #127 from ahinz/topic/woodland_polygon_ui

Add in polygon functionality