Added DynamoRevitInstall project

DynamoRevit.msi will install Revit related stuff into DynamoCore folder. 
Before installing, it will check if DynamoCore is installed in the computer or not.
I tested: 
1. No DynamoCore installed => DynamoRevit cannot be installed. Revit cannot open the addin Dynamo
2. DynamoCore installed-> DynamoRevit can now be installed -> Revit can open the addin Dynamo 0.7

Link Issue:http://adsk-oss.myjetbrains.com/youtrack/issue/MAGN-4287
@sharadkjaiswal  please review it. Thanks