sdk build: include the DarkMonkey theme in the SDK project

.gitignore

@@ -140,3 +140,4 @@
 /sdk/BasicGameTemplate/nbproject/private/
 /sdk/nbi/stub/ext/components/products/jdk/build/
 /sdk/nbi/stub/ext/components/products/jdk/dist/
+/sdk/jme3-dark-laf/nbproject/private/

sdk/nbproject/project.properties

@@ -51,7 +51,8 @@ modules=\
     ${project.com.jme3.gde.angelfont}:\
     ${project.com.jme3.gde.android}:\
     ${project.com.jme3.gde.nmgen}:\
-    ${project.com.jme3.gde.docs}
+    ${project.com.jme3.gde.docs}:\
+    ${project.org.jme3.netbeans.plaf.darkmonkey}
 project.com.jme3.gde.android=jme3-android
 project.com.jme3.gde.angelfont=jme3-angelfont
 project.com.jme3.gde.blender=jme3-blender
@@ -85,3 +86,4 @@ project.com.jme3.gde.textureeditor=jme3-texture-editor
 project.com.jme3.gde.vehiclecreator=jme3-vehicle-creator
 project.com.jme3.gde.wavefront=jme3-wavefront
 project.com.jme3.gde.welcome=jme3-welcome-screen
+project.org.jme3.netbeans.plaf.darkmonkey=jme3-dark-laf