Add option to allow API requests without an API key.
Add option to allow API requests without an API key.
Add template class for API calls to objects with no nested fields.
Create tag_sets access point.
Allow filtering by a specified field in the list call.

For example, in tags, we require a tag_sets_id param which we filter by.
Add API call for tags.
Purge unneeded variable.
Replace %3A in URLs with ':' for increased readability.
Add note saying that ':' is usually replaced with '%3A' in URLs.