Merge pull request #1 from tedr56/master

Ubuntu 13.04 compilation Fixes
- remove body-tracker (found to be laggy, impossible to use in many venues, complicated technology stack and API)
- remove 1.0 example files
- remove 1.0 gtk .rc file
- remove chipmunk physics
- remove openal
- remove game-physics tests
- move plugins/ => engine/plugins/
- remove sound related files
- remove SVG level loader and safe_eval (game-physics related)
- removed broken audio-player helper app
- remove 'Reloading <file>' message
- remove audio-environments.csv
- drop ruby 1.8 support in video-file addon
- move engine init into luz.rb
- LuzPerformer code cleanup
- remove relay port, no longer needed in 2.0
- remove odd class instance variable
- simplify rendering, no need for callback complexity in SDL / single GL context
- move constants
- remove find-by-name helpers (were used by game-physics)
- remove 'escape_quits' concept-- never does
- properly use ChildCondition#satisfied? in gui
- cleanup constants.rb