Show errors on manual save and login failures

New middleware event for showing these simple UI popups - 'ui:notify'. Lighter weight than 'ui:modal'
Escaping data.title in ui:notify middleware event
Add missing semi-colon for linter.
Show notification when load fails.
Remove old alert and move to notify middleware.
Remove center align on notification modals.
Make notifications smaller.
Style notification modal.
Merge pull request #235 from mulesoft/show-modals

Show modals