adding in support for a generic 404 message if a theme doesn't have a 404 template, rather than throw a warning/error without acknowledging its a 404.  Attempts to load a theme's header and footer between message, if theme lacks either, degrades to just 404 message.  More elegant solution welcome.  Fixes #93
adding in support for a generic 404 message if a theme doesn't have a 404 template, rather than throw a warning/error without acknowledging its a 404.  Attempts to load a theme's header and footer between message, if theme lacks either, degrades to just 404 message.  More elegant solution welcome.  Fixes #93

git-svn-id: d0e296eae3c99886147898d36662a67893ae90b2@2153 653ae4dd-d31e-0410-96ef-6bf7bf53c507

dragonmantank/Habari,dragonmantank/Habari,dragonmantank/Habari