Jd class

The first part of a C++ class to get / upload from isense.
Currently only pulls fields and posts using contributor keys.
In the future I'll add email / password support, as well as a few other API functions.
Requires picojson to make. Also, 'value' and 'object' are picojson objects.
@stowellm @bdonald25
At first I was concerned that there was no error checking and the comment simply stated "Hope this works!".  Perhaps you should add that error checking will occur just a few lines below.