Refactor auth

[alarner]

• Fixes issues #18 and #19
• Refactors registration code to be more readable and modular
• Adds a unit testing framework to perk for future use
• Upgrades a couple out of date packages

I'd love another set of eyes if any of y'all are interested in taking a peek and letting me know if anything crazy stands out @NicerHugs @dominathan

[alarner]

@NicerHugs good point. Updated to use Object.assign