Allow to build PhysicsServer in VR mode, to see the URDF/SDF robots in proper scale in VR.

Add option to have Z as up-axis for VR examples.
Add OpenVR LICENSE + README file
Don't crash VR app when no HMD is detected, just exit.
For now, don't request debug lines in client, it slows down physics server in VR mode too much.

examples/SharedMemory/premake4.lua

@@ -15,7 +15,8 @@ links {
 
 language "C++"
 
-files {
+myfiles = 
+{
 	"PhysicsClient.cpp",
 	"PhysicsClientSharedMemory.cpp",
 	"PhysicsClientExample.cpp",
@@ -24,7 +25,6 @@ files {
 	"PhysicsServerSharedMemory.h",
 	"PhysicsServer.cpp",
 	"PhysicsServer.h",
-	"main.cpp",
 	"PhysicsClientC_API.cpp",
 	"SharedMemoryCommands.h",
 	"SharedMemoryPublic.h",
@@ -84,3 +84,61 @@ files {
                         "../ThirdPartyLibs/stb_image/stb_image.cpp",     
 }
 
+files {
+	myfiles,
+	"main.cpp",
+}
+
+
+
+project "App_SharedMemoryPhysics_VR"
+
+defines {"B3_USE_STANDALONE_EXAMPLE","BT_ENABLE_VR"}
+
+if _OPTIONS["ios"] then
+	kind "WindowedApp"
+else	
+	kind "ConsoleApp"
+end
+
+includedirs {
+		".","../../src", "../ThirdPartyLibs",
+		"../ThirdPartyLibs/openvr/headers",
+		"../ThirdPartyLibs/openvr/samples/shared"
+	}
+					
+links {
+	"Bullet3Common",	"BulletDynamics","BulletCollision", "LinearMath","OpenGL_Window","openvr_api"
+}
+
+language "C++"
+
+
+	initOpenGL()
+  initGlew()
+
+
+files
+{
+	myfiles,
+	 "../StandaloneMain/hellovr_opengl_main.cpp",
+				"../ExampleBrowser/OpenGLGuiHelper.cpp",
+				"../ExampleBrowser/GL_ShapeDrawer.cpp",
+				"../ExampleBrowser/CollisionShape2TriangleMesh.cpp",
+				"../ThirdPartyLibs/openvr/samples/shared/lodepng.cpp",
+				"../ThirdPartyLibs/openvr/samples/shared/lodepng.h",
+				"../ThirdPartyLibs/openvr/samples/shared/Matrices.cpp",
+				"../ThirdPartyLibs/openvr/samples/shared/Matrices.h",
+				"../ThirdPartyLibs/openvr/samples/shared/pathtools.cpp",
+				"../ThirdPartyLibs/openvr/samples/shared/pathtools.h",
+				"../ThirdPartyLibs/openvr/samples/shared/Vectors.h",
+}
+if os.is("Windows") then 
+	libdirs {"../ThirdPartyLibs/openvr/lib/win32"}
+end
+
+if os.is("Linux") then initX11() end
+
+if os.is("MacOSX") then
+        links{"Cocoa.framework"}
+end