These are by no means complete coverage of the functions they test, but are at least a start. For consistency, all floating point comparisons use Approx(), regardless of whether they need to or not.
Removed unnecessary C++11 unique_ptr stuff, now that rcHeightfield has a constructor and destructor.
* Tests live in a "Tests" folder alongside the other components. Inside the "Tests" folder, tests are split into folders by the component they test. For example, the example unit test of "rcVdot" (which is implmemented in Recast/Recast.h) lives in "Tests/Recast/Tests_Recast.h".
* Uses the Catch testing framework
* One example test of "rcVdot"
* Tests are run on Travis and Appveyor after every build. Failing unit tests will fail the build in both case.
* Added instructions on running unit tests to the readme
