Improve support for JSON formatted HTTP errors.
Cleanup code.
Change flake8 ignore errors and fix some other errors.
Add form in home page for logged users.
Remove flake8 error for biryani imports.
Add simulation page (wip).
Change tmp images name.
Update dependances.
Externalize all matplotlib related functions to matplotlib_helpers.
Handle errors whith openfisca-web-api.
Print user form without authentication.
Use korma library (wip)
Add routes an empty templates for first pages.
Comment out bleach dependancy.
Merge branch 'korma' (WIP)

Conflicts:
	openfisca_web_ui/controllers/__init__.py
Use session to store user information without authentication.
Clean up korma related code.
Add second page route and controller.
Extract converters from controllers.
Fix flake8 warnings.