Add JSON format option to BART API wrapper

Add wrapper for full BART API and modify commands to use it

List stations in columns depending on terminal width

Fix Control-C messing up the terminal

Convert README to reStructuredText, add setuptools long description

Fix setup.py not working in Python 3

Fix transit line color for unassigned (white) trains not displaying

Update window when the terminal is resized

Fix errors indicating the terminal is too small when it isn't

Fix old estimates not disappearing when the number of estimates decre…

…ases