v.1.1.1 Metadata, documentation, bug fixes

What's Changed

• Visualize timestamp of latest X device messages by @AramAlsabti in #71
• Add metadata to IoT devices by @AramAlsabti in #74
• Optional metadata fields when managing an application by @AramAlsabti in #72
• Bugfix: Sorting of applications and device model properties by @augusthjerrild

Full Changelog: v.1.1.0...v.1.1.1