Started tutorial with FooTest.h to start.

Box2D_v2.2.1/Testbed/Tests/Tutorial/FooTest.h
  - Finished the "Making a test" tutorial
  - Finished the "Bodies" tutorial

NOTE: If you put this in your own Testbed, make sure to import and add
      it to the TestEntries.cpp file in your local version of Box2D.
Merge branch 'master' of https://github.com/dnunez02/sfml-project