Default to error out on unparsed arguments (#200)

Build/Test Cases Summary
Enabled Packages:
Enabled all Packages
0) MPI_DEBUG => passed: passed=252,notpassed=0 (0.76 min)
1) SERIAL_RELEASE => passed: passed=252,notpassed=0 (0.68 min)
2) MPI_DEBUG_CMAKE-3.6.2 => passed: passed=273,notpassed=0 (0.65 min)
3) SERIAL_RELEASE_CMAKE-3.6.2 => passed: passed=273,notpassed=0 (0.73 min)
Other local commits for this build/test group: 822a64a, 7e64c76

ProjectName.cmake

@@ -2,3 +2,4 @@ SET(PROJECT_NAME TriBITS)
 SET(${PROJECT_NAME}_USES_PYTHON  TRUE)
 SET(MPI_EXEC_DEFAULT_NUMPROCS 1)
 SET(${PROJECT_NAME}_SKIP_EXTRAREPOS_FILE TRUE)
+SET(${PROJECT_NAME}_CHECK_FOR_UNPARSED_ARGUMENTS_DEFAULT FATAL_ERROR)