travis-ci: Fix for non-sticky clang env setting.
travis-ci: Fix for non-sticky clang env setting.

The env CC=clang builds were previously getting overridden for each build since
the language: cpp defaults gcc/g++ (travis-ci was not building UPM w/clang).
This commit explicitly adds the clang compiler to the build matrix.

    * Specify gcc/clang in the compiler directive

    * Add a node.js 0.10 entry

    * Add a few debug messages

    * General cleanup of .travis.yml

    * Add the upm make install step for completeness

Signed-off-by: Noel Eck <1e36ab6ededef40f3f16bdbc1b09eee72c5d08cf@intel.com>

whbruce/upm,pylbert/upm,malikabhi05/upm,andreivasiliu2211/upm,skiselev/upm,intel-iot-devkit/upm,spitfire88/upm,Propanu/upm,skiselev/upm,Propanu/upm,malikabhi05/upm,spitfire88/upm,malikabhi05/upm,nitirohilla/upm,skiselev/upm,Propanu/upm,malikabhi05/upm,sasmita/upm,skiselev/upm,intel-iot-devkit/upm,Jon-ICS/upm,g-vidal/upm,whbruce/upm,Jon-ICS/upm,stefan-andritoiu/upm,andreivasiliu2211/upm,nitirohilla/upm,jontrulson/upm,g-vidal/upm,sasmita/upm,g-vidal/upm,whbruce/upm,nitirohilla/upm,pylbert/upm,jontrulson/upm,malikabhi05/upm,intel-iot-devkit/upm,jontrulson/upm,Jon-ICS/upm,stefan-andritoiu/upm,sasmita/upm,jontrulson/upm,intel-iot-devkit/upm,stefan-andritoiu/upm,skiselev/upm,stefan-andritoiu/upm,skiselev/upm,andreivasiliu2211/upm,nitirohilla/upm,sasmita/upm,g-vidal/upm,sasmita/upm,whbruce/upm,Jon-ICS/upm,Propanu/upm,Propanu/upm,pylbert/upm,malikabhi05/upm,whbruce/upm,nitirohilla/upm,Jon-ICS/upm,stefan-andritoiu/upm,g-vidal/upm,spitfire88/upm,g-vidal/upm,andreivasiliu2211/upm,Propanu/upm,pylbert/upm,spitfire88/upm,pylbert/upm,jontrulson/upm,pylbert/upm,intel-iot-devkit/upm,andreivasiliu2211/upm,intel-iot-devkit/upm,spitfire88/upm,stefan-andritoiu/upm