parser of w2ui querystring

Grabed here:
https://github.com/vitmalina/w2ui/blob/master/server/python/bottle/php_querystring.py

Had to adapt it for the ImmutableMultiDict that flask has on the form
property of the request object.
Merge branch 'master' of https://github.com/absorto/tianguis

Conflicts:
	tiangflask/views.py

Just kept the converting of mongo cursor to records