Getting travis to send cdash update stage component.

If we send cdash the update stage component than we are able to query
CDash based on the git SHA1 to see how the build/test did in a programmatic
way. This will result in a way to create CDash badges for Remus.

Change-Id: If2995131845820b75908ce5405dd2370595d1db8
Merge pull request #67 from robertmaynard/travis_use_ctest_update

Getting travis to send cdash update stage component.