Travis CI: test fails when building into install space

[jack-oquin]

See: utexas-bwi/bwi_common#102

To reproduce, build it this way:

 $ catkin config --install
 $ catkin build

The build step for kinova_demo fails:

Starting  >>> kinova_demo                                   
_______________________________________________________________________________
Errors     << kinova_demo:cmake /root/catkin_ws/logs/kinova_demo/build.cmake.000.log
CMake Error at /root/catkin_ws/install/share/kinova_driver/cmake/kinova_driverConfig.cmake:148 (message):
  Project 'kinova_demo' tried to find library 'kinova_driver'.  The library
  is neither a target nor built/installed properly.  Did you compile project
  'kinova_driver'? Did you find_package() it before the subdirectory
  containing its code is included?
Call Stack (most recent call first):
  /opt/ros/kinetic/share/catkin/cmake/catkinConfig.cmake:76 (find_package)
  CMakeLists.txt:7 (find_package)

I don't think the kinova_driver library is getting installed correctly.