Event Hooks

• Implemented event hooks: http://simov.github.io/express-admin-site/#events
  • preSave
  • postSave
• Fixed date formatting for timestamps inside the Listview
• Bugfix inside Mainview when only one custom app is available not configured as a view
• Improved German translation
• Added examples for pre-selecting a theme, showing images and customizing Many to Many label appearance inside the Listview: https://github.com/simov/express-admin-examples/tree/master/examples/custom/static