ADD: Added test for ComputeTubeGraphProbability.

     Added test + MIDAS keys.
ENH: Use Midas3FunctionAddTest(NAME ... COMMAND ...) syntax

     Removed explicitly setting TextCompareCommand and using the
     variable in Midas3FunctionAddTest in testing the TubeTK app.
     ComputeTubeGraphProbability (as Matt suggested).
ADD: Test for TubeTK application ComputeTubeProbability (+ MIDAS keys)
FIX: Remove accidential debug std::cout ... statements
Merge pull request #105 from rkwitt/Test-ComputeTubeGraphProbability

ADD: Added test for ComputeTubeGraphProbability
Merge pull request #106 from rkwitt/Test-ComputeTubeProbability

Test for TubeTK application ComputeTubeProbability