add edgecase handling for dashes in aws_domain

[timothestes]

Resolves https://github.com/Validus-Risk-Management/partifact/issues/2

[timothestes]

@davidsteiner Let me know what you think about these proposed changes.

Notes:

• If you decided to go this route, you can remove the parse library from the list of dependencies, since no longer being used
• URL_TEMPLATE variable still being used to create config fixtures in the unit tests. Not sure about how you want to proceed here, so I left the unit test conf alone.