Google Reader API Account Provider and initial integration

* Creation of account classes (based on FeedBin)
* Integration on Mac side into account dialog
* Initial authentication call works and extracts auth token, but no where to put it right now.

Mac/Scriptability/Account+Scriptability.swift

@@ -138,6 +138,8 @@ class ScriptableAccount: NSObject, UniqueIdScriptingObject, ScriptingObjectConta
                 osType = "FWrg"
         case .newsBlur:
                 osType = "NBlr"
+		case .googleReaderCompatible:
+				osType = "Grdr"
         }
         return osType.fourCharCode()
     }