Don't prompt if --override-release-repository-url

[icolwell-as]

Resolves #593

Please review closely as this is my first time looking at bloom source and wasn't sure how to run/test it from the source.

[nuclearsandwich]

Please review closely as this is my first time looking at bloom source and wasn't sure how to run/test it from the source.

Thanks for taking the time to contribute a fix for your issue!

I test bloom locally by setting up a python virtualenv and running python setup.py develop while that virtualenv is active.

[nuclearsandwich]

I tested this locally and it's working great for me. Thanks for the improvement!

[icolwell-as]

Thanks for testing!