Fixed malformed mailto links
Added thor to add-ons directory
Fixed issue #60 (convert_coords methods return None)
Updated Ubuntu package names to match the new ones
Added intersphinx mapping for official python documentation
Updated Ubuntu package repository name
Added missing period to some examples
Fixed use of module directive

Added explicit reference to AudioStream.play to Music's documentation
Back-ported the setup script from latest_sfml branch
Minor correction in the documentation
Corrected LGPLv3 broken link
Removed headers from examples in the documentation