Fixes #183: Update 2013 data link, point to Commercially Owned Bldgs
Exclude U Penn from bar chart.

Closes #123.
Exclude by bldg ID rather than name
Merge pull request #186 from flibbertigibbet/feature/exclude-penn

Exclude U Penn from bar chart.
Merge pull request #185 from CloudNiner/feature/2013-data-link

Fixes #183: Update 2013 data link, point to Commercially Owned Bldgs