Add short connect timeout and retry to parent requests

[themightychris]

• Set CURLOPT_CONNECTTIMEOUT' in Emergence::executeRequest()` to something low like 1 or 2
• Add $retries=1 parameter to Emergence::executeRequest() and have it return a re-invoktion of itselft with $retries- 1 if $retries > 0
• Evaluate different default values of the timeout and retries on a test instance with simulated parent failures