Better integration with other python-related packages

[Z-Clive]

For commands.py: Anaconda and other python-related packages requires python_interpreter in project settings in order to work with virtual envs.

For integrations.py Because the SublimeREPL package does not support for newer version of IPython, so this does not call that no more.

[Kristinita]

@AdrianLC , please, review this pull-request.

Thanks.