GET /integers/:id now verifies that the provided ID is in a valid (27-character) format
Updating Unirest styling to better show visual balance between code blocks
PUT /integers/:id refuses to update an integer when given an invalid ID
Integer Model .update() refuses to update an Integer when an ID is not provided
PUT /integers/:id refuses to update an Integer when the given ID is not found
PUT /integers/:id now updates the Integer number property when given a valid ID and valid integer.
Refactoring...