LP-32 add more earth files (mapquest, bing)

bing does not work well

ground/gcs/src/libs/osgearth/copydata.pro

@@ -209,6 +209,7 @@ osgearth:win32 {
         mingw_osgdb_osgearth_engine_mp$${DS}.dll \
         mingw_osgdb_osgearth_sky_simple$${DS}.dll \
         mingw_osgdb_osgearth_tms$${DS}.dll \
+        mingw_osgdb_osgearth_xyz$${DS}.dll \
         mingw_osgdb_osgearth_cache_filesystem$${DS}.dll
 
     osgearth_extra:OSGEARTH_PLUGINS += \

ground/gcs/src/share/osgearth/bing.earth

@@ -0,0 +1,23 @@
+<!--
+Mircosoft Bing Maps example.
+
+  Usage of Bing Maps requires a key. Get a key here:
+  http://www.bing.com/developers/
+
+  Bing Maps Terms of Service:
+  http://www.microsoft.com/maps/product/terms.html
+
+Supported imagery sets are Aerial, AerialWithLabels, and Road.
+-->
+
+<map>    
+    <options>
+        <!--overlay_resolution_ratio="1.0"/-->
+        <terrain first_lod="0" min_lod="20" />
+    </options>
+
+    <image name="bing" driver="bing">
+        <key>As489Vq5Fma4_GfQvtBzpPgXqJFjB3v0ZNMICy7wDVDMeBZyK2PqH2_tYLfBhpKT</key>
+        <imagery_set>AerialWithLabels</imagery_set>
+    </image>    
+</map>

ground/gcs/src/share/osgearth/mapquest_open_aerial.earth

@@ -0,0 +1,25 @@
+<!-- 
+MapQuest - Open Aerial Map
+LOD 1-12 worldwide; 12+ US-only.
+http://developer.mapquest.com/web/products/open/map
+
+NOTE: You are responsible for abiding by the provider's terms of service:
+http://developer.mapquest.com/web/info/terms-of-use
+
+TIP: set your OSG_NUM_HTTP_DATABASE_THREADS to 4 or more!
+-->
+
+<map name="MapQuest Open Aerial" type="geocentric" version="2">
+ 
+    <image name="mapquest_open_aerial" driver="xyz">
+        <url>http://oatile[1234].mqcdn.com/tiles/1.0.0/sat/{z}/{x}/{y}.jpg</url>
+        <profile>spherical-mercator</profile>
+        <cache_policy usage="no_cache"/>
+        <nodata_image>http://oatile3.mqcdn.com/tiles/1.0.0/sat/13/636/6210.jpg</nodata_image>
+    </image>
+    
+    <options>
+        <lighting>false</lighting>
+    </options>
+    
+</map>

ground/gcs/src/share/osgearth/mapquest_osm.earth

@@ -0,0 +1,22 @@
+<!-- 
+MapQuest - OpenStreetMap
+http://developer.mapquest.com/web/products/open/map
+
+NOTE: You are responsible for abiding by the provider's terms of service:
+http://developer.mapquest.com/web/info/terms-of-use
+
+TIP: set your OSG_NUM_HTTP_DATABASE_THREADS to 4 or more!
+-->
+
+<map name="MapQuest OpenStreetMap" type="geocenwwtric" version="2">
+ 
+    <image name="mapquest_osm" driver="xyz">
+        <url>http://otile[1234].mqcdn.com/tiles/1.0.0/osm/{z}/{x}/{y}.jpg</url>
+        <profile>global-mercator</profile>
+    </image>
+
+    <elevation name="ReadyMap.org - Elevation" driver="tms">
+        <url>http://readymap.org/readymap/tiles/1.0.0/9/</url>
+    </elevation>    
+
+</map>