Remove print debug
Fix division by zero when database is empty
Report: add css style to static reports.
Code refactoring
Report: add pretty static navbar.
Report: add navbar to statistics page.
Merge branch 'unstable' of github.com:yoannsculo/JobCatcher into unstable

Conflicts:
	jobcatcher.py
fixup! Merge branch 'unstable' of github.com:yoannsculo/JobCatcher into unstable
Partially revert commit 0c1cc3e.
Delete trailing whitespaces.
fixup! Delete trailing whitespaces.
Report: set column width.
Report: add config param "offer_per_page".
Adding author to config.py.
 Report: style on <select>.
Report: add css style to text boxes.
Report: change the width of text boxes.