#10: Setup HTF and QuickCheck. 

- Created TestSuite that runs all the tests using HTF;
  simply add an import to this class of the test module you want
  to enable, and it will be run.
- Created sample test module (UtilTest) with example tests
  using QuickCheck and normal assertions.
- Small fixes to INSTALL.md, to add extra configuration
  flag (--enable-tests).