Improve error reporting for JSON-RPC requests
Add trackResetOnLoad to Other Details panel

Resets the isDirty bit on the form when a new record is loaded.
Otherwise it tries to save changes on the Other Details panel when
nothings changed, causing an extra JSON-RPC request.
Auto load the movie store to prevent a harmless error on the Genre page.
Update change log
Merge pull request #82 from fyfe/feature/improve-json-rpc

Improve error reporting for JSON-RPC requests
Require Gotham 13.0 as a minimum

and remove an unrequired dependency on the xbmc.gui module.