(temporarily) remove NULLpointer region InputTest

references should never be null, actuall code does not compile under clang 3.6 that enforces that
please review
Merge pull request #181 from breznak/fix_null_dereference_clang3.5

remove NULL pointer test (dereferencing NULL)
Merge branch 'master' into c++11
Test for nupic.tools auto PR feature.
Test 2 for nupic.tools auto PR feature.
Merge branch 'master' into c++11
do not install gcc 4.8 on OSX

the brew install takes too long, won't complete in Travis
Travis OSX try install updated gcc