POST /context-creator to authentify a request in dev mode

+ refactoring
Client-side /context-creator.html
Fix error messages
Only use restify standard errors
Add tests for POST /context-creator
Move `/context-creator` to `/dev/context-creator`
Merge branch 'new-app' into fake-context-generator

Conflicts:
	app/handlers/dev/context-creator.js
	app/routes.js
	test/controllers/dev/context-creator.js
Merge pull request #79 from AnyFetch/fake-context-generator

Restore & improve context creator HTML page