Merge pull request #3049 from DynamoDS/master

merge install related changes from master #3047 to RC0.7.4_master
Merge branch 'master' of https://github.com/DynamoDS/Dynamo into RC0.7.4_master
Merge pull request #3076 from Conceptual-Design/RC0.7.4_master

Sync with master, merge all changes from master to RC0.7.4_master
Merge branch 'master' of https://github.com/DynamoDS/Dynamo into RC0.7.4_master
Merge branch 'master' of https://github.com/DynamoDS/Dynamo into RC0.7.4_master
Merge branch 'master' of https://github.com/DynamoDS/Dynamo into RC0.7.4_master
Merge branch 'master' of https://github.com/DynamoDS/Dynamo into RC0.7.4_master
Re-enable two properties on Element.
Merge remote-tracking branch 'origin/RC0.7.4_master' into RC0.7.4_Revit2015