Added Placeholder files so that folder structure for ReferencedAssemblies is retained.

src/ReferencedAssemblies/4.1.3496.0/Files.txt

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+Following files from FIM hotfix build v4.1.3496.0  (https://support.microsoft.com/en-us/kb/2906832)
+1. Microsoft.IdentityManagement.WebUI.Controls.dll
+2. Microsoft.IdentityManagement.WFExtensionInterfaces.dll
+3. Microsoft.ResourceManagement.dll
+4. Microsoft.ResourceManagement.WorkflowContract.dll

src/ReferencedAssemblies/Files.txt

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+1. System.Management.Automation.dll v1.0.0.0 from C:\Windows\assembly\GAC_MSIL\System.Management.Automation\1.0.0.0__31bf3856ad364e35