Fixed navigation in cluster overview
Fixed a type in bootstrap
Added a cancel button to all plans
Added cancel buttons to plan selectors and reverted to simple view for dashboard with added back button and back-button in browser working
Merge branch 'sharding' of https://github.com/triAGENS/ArangoDB into sharding
Added a server shutdown button to the navigation bar and created a modal view fpr the dashboard. NOt used yet due to problems with statistics in modals