Add gif of running simulation to the README file.

Add Dependencies and Simple example code.

Add gif of the simple example code.

Fix Simbody link.

Fix Simbody link.

Add build instructions.

Misc cleanup of readme.

Update travis link in README now that repo is public.

Add SWIG as dependency.

Fix instructions for setting env vars on UNIX.

Fix Mac env var instructions.

Remove OpenSim:: from Joint class names in README.

Add test to make the README example gif.
Enable visualizer in testREADME.
[testREADME] Don't show visualizer during testing.
Added swig to apt-get call.
Merge pull request #117 from moorepants/readme

Added swig to apt-get call.
SimTK_INSTALL_DIR->SIMBODY_HOME

Anticipating changes #98.
[readme] Address @moorepants' suggestions.
[readme] Fix /opt mistake.

I previously edited the mac section when I had meant to edit the ubuntu section.
[readme] Address @aseth1's comment about TESTING macro.
Merge pull request #96 from opensim-org/readme

Update to README.md