RevFramework apps now provide their own entry point (similar to the way django works)
 - Added new RevApp base class (which is a subclass of Flask)
 - Added rev.cli module to handle all cli-related stuffs
 - Added a pluggable cli API to allow additional commands to be registered
Moved all 'core' modules into appropriately named sub-modules of 'rev'.
Added CLI with support for 'runserver' and 'syncdb' functions
Added 'db' submodule with the possibility for multiple database providers
Completed initial refactoring and implementation of module-loader, which is now based on an INSTALLED_MODULES setting, rather than being driven by the database and command line parameters. (much better for version control!)