Fixed #24 -- Made form translations lazy.
Removed 2 unneeded functions.
Removed 2 unused methods of Entity.
Documented Entity.get_absolute_url.
Added new analysis: distribution of entities earnings/expenses.
Fixed some translations on new analysis.
Implemented search on entities using django-sphinxql.
Implemented search on contracts using django-sphinxql.
Removed unnecessary template and cascaded changes.
Added message anouncing new feature.
Made most js libs to be hosted by cdnjs.
Revert "Added message anouncing new feature."

This reverts commit 02af53238b8e2e191d8064b0adba1162f2280c9a
to remove the message.
Removed unused methods of Category, and simplified the existent ones.
Improved query to test if tenders exist.
Improved main view of contract.
Improved main view of entitites.

Also made it compatible with mobile and tablets.
Improved summary of contract.

Also fixed translation error of previous commit.
Made css of prices valid outside summary.
Made last contracts part of new UI of entity page.