Left-align headings on accordion.
Hide bottom border on last accordion header.
Remove accordion entries that have no children.
Hide section in left nav if no elements (i.e. don't show Equipment when
zero equipments for that account.)
Fix heights on thumbnail images and account logo.
Merge branch 'performance-jason'

* performance-jason:
  revised account_detail template and view to use get_bars, get_tables, and get_pies instead of get_building_view_meter_data; now moving to break down get_account_view_meter_data and get_space_view_meter_data
  successful first step - pulled get_building_view_meter_data into stand-alone function and used it instead of the original, and buiding view loads fine
  testing commenting out of get_building_view_meter_data
  narrowing account summary page down to big time consumer by removing tabs in templates and only calculating the summary page data
  working copy of decimal to float conversion
  removed print statement
  more tweaks to move from decimal operations to float operations, this one the very important float wrapper in the get_dataframe function
  switched all code to operate on floats but continue storing decimals
  WIP: investigating performance issues with account page loading.