Don't show unhandled exception dialog when runtime is already paused.
Case 560134.
Added UnityEngine.Sprite* keywords
Fix crash upon history navigation when a document with history is deleted

Fix case 563013
make sure we trigger OnHistoryChanged events (changed would never be true)
Do not report false "possible compiler crashe" when build is cancelled.

Fix case 551523
Merge pull request #32 from Unity-Technologies/unity-staging

This week's MD fixes