Updated NullAnnotator to pass the function to the FindSentinals pass,
updated directory structure to start the process of creating a test
suite for the NullAnnotator.
Made FindSentinels into a Module pass because
LLVM does not permit Module (NullAnnotator) to
depend on FunctionPasses (originally FindSentinels)
which themselves depend on ModulePasses(IIGlueReader).
Fixed up NullAnnotator to reflect that FindSentinels
is now a ModulePass.
Merge branch 'interprocedural-analysis' of https://github.com/AlisaMaas/CArrayIntrospection into interprocedural-analysis

Conflicts:
	FindSentinels.cc