v0.2

API Changes:
* Updated readme to be more readable.
* Added missing functionality including chart data and order data.
* Added query alternatives for optional arguments.
* Added Tester class to help troubleshoot basic problems.
* Changed the order of string outputs to have the date first.
* Changed all dates to be in the format of 'yyyy-MM-dd HH:mm'

MarketLogger Changes:
* Made it not overwrite old files by appending a number to the end of
the entire filename.
* Updated headers to have the date in the leftmost column.