Feature/241 cookie banner remove template

Closes #241

Banner and Form templates removed from config defaults
Documentation in Readme and HTML updated to reflect that providing these functions is now mandatory
Added a check before initialising the banner to make sure these are provided, and warns in the console if not found
Updates tests and examples so that they run with the new config requirements
Adds a new test to check that banner doesn't run if config is missing.

stormid / components