Using mocha, chai, and nyc
* tests for parsing string for numeric value comparison
* tests for parsing string for durations and duration comparisons
* tests for parsing reddit entity (subreddit/user) from string
* tests for parsing submission/comment id from reddit permalink string
* tests for initial config parsing/merging
Still can't get nyc to get coverage for everything in src using "all" -- causes reporting to show 0 for everything??
* Implement declaration file for snoowrap errors so they can be imported directly
* Implement logging function to handle boilerplate for known error responses (reddit HTTP response, rate limit, etc.)
* Add abstract user class with auth methods with implementations for client/server
* Refactor client/server logic to use class methods instead of inline auth checks
Closes#71
