Add error checking on front end

[ARMmaster17]

Users have reported issues with the front end timing out. Need to look at the following:

• Await #18
• If private API returns no available workers, allow resending of message
• Have longer timeout in HTTPClient call

[ARMmaster17]

Linked with #16

[ARMmaster17]

http://stackoverflow.com/questions/3543683/determine-if-ajax-error-is-a-timeout Closes #20 as invalid.