[Sandbox] Tieing up lose ends in the first draft of sandboxing capability
Added validates_associated :account validation check
[Sandbox] Ensure that scans available during sandboxing
 Compacted some code
Minor bug fix. HTML params come as strings and have to be interpreted as such
[notifications]: Let new notification take precedence over any old / current notification
[sandbox] Usability tweaks ....

1. Disabling buttons for flipping / resetting scans in sandbox mode
2. Giving gratuitous tips on sandbox activation
Sanity checks added in query methods 'available' and live?