Modular signUp, bug fixes and refactoring for 1.3

• fix(controller): return the Promise so the response is sent
• fix(includes): add as option to model associations, to support autoHooks and nestedOperations
• feat(model): Include Account in the query for Users
• fix(model): spelling mistake
• chore(cleanup): Remove old preRoute module hook
• refactor(service): Split up into more modular event based signup flow
• fix(Controller): Correctly parseInt for id's in addAccountIdToRequest middleware helper
• refactor(seedData): New default seedData for node-seed 1.3 and 1.3 modules
• release(1.2.1): Modular signUp, bug fixes and refactoring for 1.3