Fix failed unit test case: VisualizationInSyncWithPreviewUpstream
Separating out FScheme and DSEngine test cases to get the clear results
fixed bad equals comaprison
Merge branch 'master' of https://github.com/ikeough/Dynamo
Merge pull request #892 from Benglin/master

Fix unit test case: VisualizationInSyncWithPreviewUpstream
Merge pull request #893 from riteshchandawar/master

Separating out FScheme and DSEngine test cases to get the clear results
Merge branch 'master' into ChocoButterUI

Conflicts:
	src/DynamoCoreUITests/RecordedTests.cs
1. Updated "topControl_MouseLeftButtonDown" method to set "e.Handled" if it has not really handled it.
2. Updated "nodeUI_MouseDown" method to set "e.Handled" if it has not really handled it.
Merge pull request #898 from Benglin/MAGN528

Fix: Double-clicking on Python node does not bring up editor
1. Removed Opacity from InfoBubbleViewModel
2. Refactored InfoBubble so that UI changes are performed in View instead of ViewModel
Shifted thread dispatcher to InfoBubble
Corrected fading out info bubble.