Add ROS driver for Piksi gps module (UBC-Snowbots#416)

* Add ROS driver for Piksi gps module
Add supporting Swift Navigation Binary Library to external libs folder (libsbp)

* Cleaned Up PR mistakes

* More minor mistakes

* Fixed name of external piksi

* Told ROS to not look for libswiftnav

* Fixed  spelling error

* fixed line 54 to make install_dependencies.sh skip libswiftnav.

* fixed error in install_libspb, corrected a change directory

.rosinstall

@@ -35,3 +35,4 @@
 - git:
     local-name: external_libs/joycond
     uri: https://github.com/DanielOgorchock/joycond
+