Removed Asset.timestamp configuration

since it is now an available Setting in Croogo (related to croogo/croogo#287
Remove cakephp package repository

See: #9
Change test database to memory backed sqlite
Note about using git for installation + script + composer.json
Fix: Invalid composer.json
Remove test URLs
Add -h and -r options to Console/add_submodule
Fix instruction to use Console/add_submodule

Closes #11