Deletes old versions; sets up System, Item, World to modify Burner classes.
Adds record properties and methods; adds system test stub.
Updates getAllWorlds(); adds tests for getAllWorlds() and getAllBuffers().
Updates system tests.
Updates system tests; updates Burner dependency.
Renames System data related methods.
Updates system tests.
Updates var scope in System.loop().
Adds all system tests; adds todo for System.stepForward().
Creates agent flocking example.
Adds Item and World tests.
Updates Item tests.
Updates public files.
Updats travis file.
Updates README and public files; updates world default gravity.
Adds Anim and AnimUnit classes/tests.
Adds public Anim example.
Merge pull request #4 from vinceallenvince/vince/burner

Vince/burner