Trader can see a List of Holdings table

- Add "No holding" div when there are no items in the list

[#46895973]
Fix nasty event bug

- Add load mask to Login, Signup & Logout
- Move 'authenticated' state setting to the top of the method, before other events can fire (hopefully)

[#46895973]
Merge branch 'sencha-mobile' of github.com:vFabric/springtrader into sencha-mobile