Added documentation on HTTP requests.


git-svn-id: http://urho3d.googlecode.com/svn/trunk@2553 3bd170d8-ddcf-f82c-f583-7a401ccf5608
Updated documentation regarding Engine::Exit().


git-svn-id: http://urho3d.googlecode.com/svn/trunk@2554 3bd170d8-ddcf-f82c-f583-7a401ccf5608