This adds the basics of the component API:
* listing of components assigned to a project
* adding new components to a project.
The interface to 'add component' is similar to that of 'labels', as
previously discussed. We can implement remove/update later.
Support the lowest common denominator for default_edit_template, as per #23
`reporter` is not usually editable by unprivileged users. Even if it is left as-is,
the PUT request is trying to update it, resulting in the following error:
{"errorMessages":[],"errors":{"reporter":"Field 'reporter' cannot be set. It is not on the appropriate screen, or unknown."}}
Commenting out the field leaves the information visible, so is a reasonable compromise.
Cory Bennett