It might be the case that we may want to post raw data in the future; in
fact, I can guarantee it. We'll cross that bridge when we come to it.
* src/dapi/http/XhrHttpImpl.js (openRequest): Set ContentType header
on POST
* test/dapi/http/XhrHttpImplTest.js: Modified accordingly
The Data API is being heavily refactored and tested; while moving files into the
Liza repository, I noticed some inefficiencies with the design. These are being
heavily improved upon.