Merge pull request #527 from SeanNguyen/ChocoButterUI_Popup

Implement Info bubble
Added style for Preview Bubble
Integrated preview with WorkspaceViewModel.cs
Completed Frame Implementation for Node's preview
Added text content for Preview Bubble
Removed original tooltip of node
Changed in Dynamo.2012.sln.
SandBox project back to x64 platform
Added some comment
Update the relative position of Nodes and Preview Bubbles
Merge branch 'ChocoButterUI_NodePreview' of https://github.com/SeanNguyen/Dynamo into ChocoButterUI_NodePreview