Page: Improving next job methods

Get if last review is None or last review is expired
Facts model: Removed dead code
Freeze requirements
Compressing facts and violations with gzip (Fix #72, #78)
Refactoring AOPIC algorithm

Changes:

* No increase all pages with lambda score tax.
* No add 0 for page score after review.
* Removing settings table
new version of material girl
Set prime numbers as times and move them to config (fix #88)