Went through more of the tutorial

Box2D_v2.2.1/Testbed/Tests/Tutorial/FixtureTut.h
Box2D_v2.2.1/Testbed/Tests/Tutorial/ForceTest.h
Box2D_v2.2.1/Testbed/Tests/Tutorial/FrictionTut.h
Box2D_v2.2.1/Testbed/Tests/Tutorial/GravityTest.h
Box2D_v2.2.1/Testbed/Tests/Tutorial/SpeedTest.h
  - Finished the "Fixture" tutorial [FixtureTut.h]
  - Finished the "World Settings" tutorial
  - Finished the "Forces and Impulses" tutorial [ForceTest.h]
  - Finished the "Custom Gravity" tutorial [GravityTest.h]
  - Finished the "Moving at constant speed" tutorial [SpeedTest.h]
Updated it to ignore ~ files in Tutorial folder