Merge pull request #14 from lbondaryk/SanitizeNode_555

Post code review with Sean
Merge pull request #15 from lbondaryk/SanitizeNode_555

Handling Ctrl+C
Moving hub.mock.js to /mock directory
Changing 'type' to 'assessmentType'
Adding mock for correctness engine.
Adding correctness engine url to config.
IPS->CE unit tests (ECOURSES-548).
First pass on ceproxy.
Promise up the IPS postSubmission.
Padding out the test objects so they're a bit more useful.
IPS->CE API implementation.
unnecessary comment.
tabs to spaces
Merged with CE branch