Moved spreadsheet from briefcase/core to briefcase/apps.

Preparing for new registration method and auto discover installed apps.
removed random extra file (added accidentally)
Updated spreadsheet for new path (apps instead of core)

Also updated spreadsheet to use relative module paths:
models._______ instead of briefcase.core.spreadsheet.______
added init file to allow briefcase/apps to be py module
removed unneeded import from spreadsheet app
Added support for "installing" all apps in briefcase/apps

Searches the directory and auto adds ALL directories in briefcase/apps as installed apps.
URL's build dynamically now!

Urls are accessed from each module that has a briefcaseRegister.py file in insalled apps.
Cleaned up briefcase/core/urls.py

Removed all static mappings to applications
Added prefix to eliminate module name replication
Updated spreadsheet briefcaseRegister to use new format
added heroku files
added all the requirements