Add delete button.
Add configuration to use custom Persona site.
Code cleanup.
Auto-compute copyright years.
Merge branch 'dev' into prod

Conflicts:
	openfisca_web_ui/templates/site.mako
Sort configuration option.
Use uuid.hex instead of reinventing it.
Use real URL converters.
Correct OpenFisca casing.
Use plural forms for modules.
Code cleanup.
Converter input_to_words has been moved to base module.
Handle connection to API error.
Pass button name to query only if exists.