Build PSReadLine for ConsoleHost

src/Microsoft.PowerShell.ConsoleHost/project.json

@@ -11,6 +11,7 @@
     },
 
     "dependencies": {
+        "Microsoft.PowerShell.PSReadLine": "1.0.0-*",
         "Microsoft.PowerShell.Commands.Management": "1.0.0-*",
         "Microsoft.PowerShell.Commands.Utility": "1.0.0-*"
     },

src/Microsoft.PowerShell.PSReadLine/project.json

@@ -17,6 +17,8 @@
                 "define": [ "CORECLR" ]
             },
             "imports": [ "dnxcore50", "portable-net45+win8" ]
+        },
+        "net451": {
         }
     }
 }