Using posts for modifying operations.

It looks like we've addressed the issues with POST in the emacs http
layer, so we're free to do this :) Now we can probably move forward with
webtest stuff as well.
some webtest doodling. This doesn't work.
Fixed references to Project.
json-api test now using webtest.
long-running test now using webtest.
now running json-api tests for python 2 *and* 3.
long-running test now using unittest framework