Revert

Author: pkasila

Sources/CEExtensionKit/ExtensionInterface.swift

@@ -9,5 +9,16 @@ import Foundation
 
 /// A protocol for extensions to conform to
 public protocol ExtensionInterface {
-    init(extensionAPI: ExtensionAPI)
+}
+
+open class ExtensionBuilder: NSObject {
+    required public override init() {
+        super.init()
+    }
+
+    /// Builds extension with API
+    /// - Parameter withAPI: the API implementation itself
+    open func build(withAPI api: ExtensionAPI) -> ExtensionInterface {
+        fatalError("You should override ExtensionBuilder.build")
+    }
 }