add tenant model
fix error-path, and styling of tenants page
add 'my account' and 'upgrade to admin' pages
 fix admin upgrade path
add ability to reset the cache from a webpage
remove remnant of logo serving through rails app
fix error when user doesn't choose country of residence. Also make country/state 'chosen-select'
fix creation of registrant address
move paypal_account,paypal_test into event_configuration
fix event_configuration spec
change paypal invoice number to a random hex to avoid 'invoice already paid' errors
make payment#invoice_id unique to avoid paypal having multiple entries for the same invoiceid
add invoice id to the payments page
enable use of multiple registration systems on one server
fix default mailer url, and tenant page
enable tenant creation
fix tenant creation to not be confused with 'current tenant'
fix tenant switch on creation
add ability to load 'only' tenant when none are defined
fix feature specs