Clean up and test summary

Created by: dcampbell24

Problem:

• Ion does not load a history file
• Default values are being set in an ad-hoc manner rather than implementing the Default trait.
• Some of the documentation wording is awkward.
• Some functions are imported without keeping their module name.
• Ion does not track the execution time of the commands it runs.

I can add more to this. I just want to get it out since I wrote it a while ago now.