Fixed the test failures on phantomjs and added a configuration option to let the user choose between getting an attachment as text or as a Blob, defaulting to text.

if username was '?fakeparam=heyho&else=', you could give any URL parameter you want.
The characters '?' is now escaped.

Stores documents and attachments, attachments accept and return Blob type.
Tests are run with mocks and if the URL containt /xwiki/bin/ then they are run on the live wiki
    (user must be logged in for them to pass).

browserlocalstorage.js removed