Standardize JSON Responses across APIs

[lobodemonte]

Currently all of RC calls return the json format we receive from each API provider, which leads to a lot of work to access common field on the user end.
We need to provide instead a common response object that has methods for accessing these fields (like doi, title, authors, etc.)

[ceteri]

The master branch as of release v1.1.1 has the _ScholInfraResponse class which we can use for this.

We can wrap the returned params meta, timing, message in that -- then add accessor methods. It could be serialized as JSON, for storing results during the workflow steps in RCGraph

[lobodemonte]

Forgot to also include these changes into the original release 1.2
They will need to be included for this issue to be closed
#70