Renamed Doc images and updated for 0.5

- Renamed the documentation screenshots per version.

- Updated the object-mode.png to 0.5 to reflect new features.

Signed-off-by: Jonathan Williamson <jonathan@cgcookie.com>
Added Tracker and Wiki URL

- Added the URLs for the JayTools tracker and Wiki pages.

Signed-off-by: Jonathan Williamson <jonathan@cgcookie.com>