Update dependencies
Use different database of Catarse's development/test

Also removes duplication inside the file.
Rewrite sections of README to summarize installation process

Includes new section "To go out of the sandbox".
Remove submodule initialization instructions

Currently is not working. A short-term solution is removing the
instructions about it and using the dummy application already present in
the repository.
Include instructions about running test suite on README
Rename PaymentEngines to PaymentEngine

Neighborly application previously renamed its interface to register
payment engines.