MAGN-3023. Port Sun Path node.
Remove old updater, and add some notes.
Clear selection nodes references when document switching. Improve document switching messages.
Repopulate drop-down nodes when document switching.
Revert "Remove old updater, and add some notes."

This reverts commit 0c2bcd2e04fc77051b2fef8fffd851db81036703.
Revert "MAGN-3023. Port Sun Path node."

This reverts commit 3f54726c2bd9e2e6c4533908c9e3a90581a87436.
Merge branch 'master' of github.com:DynamoDS/Dynamo