Use switch syntax in resolve functions

Stencil/Variable.swift

@@ -87,19 +87,16 @@ public func ==(lhs: Variable, rhs: Variable) -> Bool {
 
 
 func resolveDictionary(current: Any?) -> [String: Any]? {
-  if let dictionary = current as? [String: Any] {
+  switch current {
+  case let dictionary as [String: Any]:
       return dictionary
-  }
+  case let dictionary as [String: AnyObject]:
-
-  if let dictionary = current as? [String: AnyObject] {
       var result: [String: Any] = [:]
       for (k, v) in dictionary {
           result[k] = v as Any
       }
       return result
-  }
+  case let dictionary as NSDictionary:
-
-  if let dictionary = current as? NSDictionary {
       var result: [String: Any] = [:]
       for (k, v) in dictionary {
           if let k = k as? String {
@@ -107,26 +104,23 @@ func resolveDictionary(current: Any?) -> [String: Any]? {
           }
       }
       return result
-  }
+  default:
-
       return nil
   }
+}
 
 func resolveArray(current: Any?) -> [Any]? {
-  if let current = current as? [Any] {
+  switch current {
-    return current
+  case let array as [Any]:
-  }
+      return array
-
+  case let array as [AnyObject]:
-  if let current = current as? [AnyObject] {
+      return array.map { $0 as Any }
-    return current.map { $0 as Any }
+  case let array as NSArray:
-  }
+      return array.map { $0 as Any }
-
+  default:
-  if let current = current as? NSArray {
-    return current.map { $0 as Any }
-  }
-
       return nil
   }
+}
 
 func normalize(current: Any?) -> Any? {
   if let array = resolveArray(current) {