Remove the use of miniconda from galyleo; restrict use of default channels

[mkandes]

Anaconda, Inc has recently changed their terms of service.

https://legal.anaconda.com/policies/en/?name=terms-of-service#terms-of-service

We should plan to replace the use of the miniconda installer and/or make the installer change an option for the end user. And we should attempt to restrict the use of the default Anaconda channels, except to users of galyleo that acknowledge they are aware of the new terms of service from Anaconda, Inc.