Compile banjax with libraries to detect memory corruption bugs

[DonnchaC]

Address Sanitizer (ASAN) an Valgrind are useful tools to detect memory corruption bugs in C and C++ software. ASAN is ~2x slower than the normal execution. It may be reasonable to run Banjax in production with ASAN enabled to give us some defense-in-depth.

https://github.com/google/sanitizers/wiki/AddressSanitizer http://valgrind.org/