progress bar for the file upload CLI

[mheilman]

It'd be nice to have a progress bar show up for civis files upload and civis files download.

possibilities:

• https://pypi.python.org/pypi/tqdm
• https://pypi.python.org/pypi/progress
• https://pypi.python.org/pypi/progressbar2
• https://stackoverflow.com/questions/3173320/text-progress-bar-in-the-console

[beckermr]

Click has something too. I have used many of these and tdqm is def the best I have seen.