setup: Added clang and llvm

Adds clang and llvm include directories and libraries to the build. The
environment variable CLANG_DIR is used to define the location of llvm
and clang. A simple clang tool implementation was added to assure proper
operation of the libraries.

README.md

@@ -7,11 +7,13 @@
 * QT 5.2.1
 * CxxTest 4.3
 * Valgrind 3.9.0(linux, macOS)
+* Clang & LLVM (installation guide http://clang.llvm.org/docs/LibASTMatchersTutorial.html)
 
 ##### Environment Variables
 
 * QT_DIR - ...\Qt\Qt5.2.1\5.2.1\<IDE>\
 * CXX_TEST_DIR - .../cxxtest-4.3/
+* CLANG_DIR - .../clang-llvm/
 
 For Win32:
 * VLD_DIR - .../Visual Leak Detector