Updated manifest to use new build pack.
Ignore swp files.
Extension now downloads CodeIgniter and copies the application and system directories to 'app/code-igniter'.  Should also override the application folder with anything in the user's application folder.
Moved index to top level of project folder.
Added cfignore file to prevent upload of .git and other files.
Code from static pages part of CodeIgniter tutorial.
Made CodeIgniter install directory easily configurable.
System path and application path need to be set.  The path to use depends on where the extension places the files.  In this case, we've just hard coded the path.  A more complete extension would set this automatically.
Added the configuration file so that we can override the default
configuration.  In this case we're setting the log level and location.
The test controller checks that a given page exists.  It does this by looking at the file system.  We need to use the full path to the template.  Again, this is hard coded but the extension could possibly do this automatically.
Customize the way that we proxy to PHP-FPM.  This is necessary so that CodeIgniter can use 'clean' URL's like '/controller' instead of '/index.php/controller'.