Add process queries (#78)
Add process queries (#78)

* Improvements handlers of Rollback/Commit

* Add endpoint to _QUERIES with location of scripts

* Create function to mock scripts to test

* Add functions to execute sql scripts

* Fix table name

* Add queries doc on README.md

* Remove CreateSQL function because no has secure way of executing this
snippet code in commit 59e1e83bfa7 with SQL scripts. Table name and
others informations in script it's hard to retrieve

* Remove RETURNING clause

* Change templates vars to lowercase

nuveo/prest,nuveo/prest