Queue - Updated CURL library to Guzzle

Done:

• Removed deprecated CURL library and replaced it with Guzzle

Why:

• CodeIgniter CURL library is deprecated - https://github.com/philsturgeon/codeigniter-curl
• Setting queue and job ID's weren't getting passed in the HTTP header as it was meant to.

Implemented for:

• https://git.customd.com/dandi/pulse/merge_requests/400

Test:

1. Create a queue job
2. Confirm the CURL works and the queue job is updated as "completed"
3. Confirm the queue and job ID's are sent in the HTTP header

$queue_id = $this->input->server('HTTP_QUEUE_ID');
$job_id = $this->input->server('HTTP_JOB_ID');```