Password entry via command parameters should be removed

[yeahnope]

There should not be an option to enter your google password via the command line. At least on unix-like systems this will leak the password in two ways:

• It will be written to .bash_history
• It will show up as part of the process name visible to other users when for example running htop
  Users that are most likely to use this form of password entry are those that won't know why it is such a bad idea.

Having an easy way to enter the password that does not leak the password could be done with the getpass module:

config['password'] = getpass.getpass('Enter Password':)

[pataquets]

@yeahnope : In general, password is deprecated in favour of OAuth2, no matter how you provide it. Check #118, and see if it helps close the issue.