Updated docs
Updated README to be more readable, with more section headers.
Added docs. Refined docs/readmes. Edited pmp_client.forward method to (hopefully) fix a bug. Once we have finished the tests, they should confirm it behaves as expected.
Built a unittesting server that will return JSON based on specific header or specific query_param.
Working on tests for pmp_client module. Discovered some bugs.

Bug in pager/navigabledoc interaction where multiplte 'navigation' elements are
present in a doc. Refined that a bit.

Also, found a bug in the history element of client: it was checking for
2 or more entries before using the history instead of greater than
zero.

NavigableDoc now uses its own links property in order to build nav
elements.

Built authdetails fixture for testing and fixed a bug in test-server
implementation as well.
Finished tests for pmp_client module.
Merge branch 'feature/test-client' into develop

Feature test-client completed and a few bugs addressed
Bumped version and updated changelog.
Merge branch 'release/0.3.0'