Multiple functionality

[Kostanos]

1. Skip queries if pgRestifyResponseBody is not empty (in every request, not only on getList)
2. Access parent object to get access to parent helpers like: convertColumnsToFields and others
3. Return info after POST or PUT

[coveralls]

Coverage decreased (-3.4%) to 95.904% when pulling 55e4275 on Kostanos:master into 69c46aa on acarl:master.

[Kostanos]

Hi, I've creates again the PR you closed.
Check my comments about parent access, return value on insert/update
also I added on every request the verification if pre-hook already added some content to body

[acarl]

Please separate these into a pull request per feature change. At this point it would probably be easier for you to clone the repository again to avoid the current multiple commits. Ideally there would be a single commit for each change.

You also did not address fixing the test cases.

Look at some other repositories for examples of pull requests. There are some good examples in the pg repository like the following.
brianc/node-postgres#1448