Allow user to add events to meters.
Allow user to add events to equipment.
Allow user to add events to spaces.
Allow user to add events to buildings.
Allow user to add events to accounts.
Merge pull request #3 from buildingspeak/master-userAdditionOfEvents-shane

Allow user to add events to accounts/buildings/spaces/meters/equipment
Re-update account_details template for formatting.
Enable use of fullwidth main content section depending on presence of stripe_pk.
Add add_payment_details page and form.
Use a partial for the credit card details form.
Add update payment details template and view function.