Added error-alert div and a view (to render into it), and an
ajaxError handler to render the view.
Report Bug button added to errors.
add a hide button, improve error message, fadeIn and out
Merge branch '20130809-global-errors' of github.com:scraperwiki/custard into 20130809-global-errors
error bar shows and hides properly

* We're no longer removing all alerts on routes <-- WARNING
* Make sure fullscreen doesn't overlap toolbar when we show alert
* Make alert flash
replace console.warns with error events

Also don't raise error events for some stuff we already handle with
alerts
add ErrorAlert view test, tiny refactor
integration test for ajaxError on ErrorAlert, refactor

Here we make ErrorAlert responsible for registering an ajaxError handler
Merge branch '20130809-global-errors'