Update README.md
Fix guid setting

1. Fix where the guid is set when adding a node.
2. This is based on the fix by Ben:
https://github.com/DynamoDS/Dynamo/pull/2028
Documents should end with a new line

Synthetic change to trigger a build
Update README.md

Second retrigger
Fixing issue with Signature file generation

If the certificate for the current user is not installed in LocalMachine
store location, check it in CurrentUser store location.
Merge branch 'RC0.7.3_Revit2015' of https://github.com/DynamoDS/Dynamo into RC0.7.3_Revit2015