added project listing
rewrote every url to use /project/:id/...

project configuration can be done in webui.conf

For Example:
{
   name           => 'Rex Web Delopyment Console',
   server            => "http://localhost:5000",
   secret_passphrase    => 'rex-webui',
   projects => [

      {
         name        => "Sample Project",
         rexfile     => "SampleRexfile",
         description => "This is a sample Project. With a few tasks.",
      },

      {
         name        => "Sample Project 2",
         rexfile     => "SampleRexfile2",
         description => "This is an other sample Project.",
      },

   ],
};
Merge pull request #2 from krimdomu/project-listing

added project listing