Update memory.py

Add Committed_AS data to collected keys
Make handling of mongodb config more robust

- Make sure hosts parameter is interpreted correctly
- Enable option to always specify an alias
Merge pull request #661 from johnseekins/master

Update memory.py
Merge pull request #664 from hdeheer/patch-1

Make handling of mongodb config more robust
Merge branch 'master' of github.com:BrightcoveOS/Diamond