Fixed setting name of Django-sphinxql.
Fixed import to work in Django 1.7.
Added new task to update entities.
Increased timeout of crawler.
Added tasks for retrieving tenders and contracts.
Made tender description a TextField.
Improved parsing of DR Series.

When BASE does not provide the series, we now extract it from the
DR document's url.
Improved how last base_id is computed in crawler.

It now returns the last base_id from files or from db.
Fixed bug on cleaning tender form.