Fix receiver logging

Noticed by Topcoder when moving to AWS:

The logger setup is either very messy, or just plain wrong. In app.js, it���s importing morgan as logger but then calling logger.logFullError, which is a function on utils/logger.js. This should be refactored into one unified and clean logger

Fix:

The Topcoder-X processor has good logging, so let's:

1. Remove morgan as a dependency in the receiver
2. Copy in the logging implementation from the processor
3. Update the receiver code to use the new logging implementation from the processor.

Final Submission Guidelines

Upload the updated code to TopCoder