- update gitignore to not ignore the precompiled bullet natives

.gitignore

@@ -123,4 +123,10 @@
 *.so
 *.jnilib
 *.dylib
-/sdk/dist/
+/sdk/dist/
+!/jme3-bullet-native/libs/native/windows/x86_64/bulletjme.dll
+!/jme3-bullet-native/libs/native/windows/x86/bulletjme.dll
+!/jme3-bullet-native/libs/native/osx/x86/libbulletjme.dylib
+!/jme3-bullet-native/libs/native/osx/x86_64/libbulletjme.dylib
+!/jme3-bullet-native/libs/native/linux/x86/libbulletjme.so
+!/jme3-bullet-native/libs/native/linux/x86_64/libbulletjme.so