Fix Mac OS X Travis, fix UAVCAN URL

.gitmodules

@@ -6,7 +6,7 @@
 	url = git://github.com/PX4/NuttX.git
 [submodule "src/lib/uavcan"]
 	path = src/lib/uavcan
-	url = git://github.com/jgoppert/libuavcan.git
+	url = git://github.com/UAVCAN/libuavcan.git
 [submodule "Tools/genmsg"]
 	path = Tools/genmsg
 	url = https://github.com/ros/genmsg.git

.travis.yml

@@ -102,7 +102,7 @@ script:
   - echo 'Running Tests..' && echo -en 'travis_fold:start:script.4\\r'
   - make px4fmu-v2_default test
   - echo -en 'travis_fold:end:script.4\\r'
-  - make px4fmu-v2_default package
+  #- make px4fmu-v2_default package
   #- make posix -j4
   #- ccache -s
   #- echo -en 'travis_fold:end:script.1\\r'