Improves Controller and Adapter relationship

- Controllers that have adapters are AdaptableControllers
- AdaptableController is responsible to instantiate the proper adapter if needed (string, function or BaseAdapter)
- BaseAdapter is the base class for adapters, allows skipping when passed directly to the controller

src/Controllers/AdaptableController.js

@@ -0,0 +1,63 @@
+/*
+AdaptableController.js
+
+AdaptableController is the base class for all controllers
+that support adapter, 
+The super class takes care of creating the right instance for the adapter
+based on the parameters passed
+
+ */
+
+export class AdaptableController {
+   /**
+   * Check whether the api call has master key or not.
+   * @param {options} the adapter options
+   * @param {defaultAdapter} the default adapter class or object to use
+   * @discussion
+   * Supported options types:
+   * - string: the options will be loaded with required, when loaded, if default 
+   * is set on the returned object, we'll use that one to support modules
+   * - object: a plain javascript object (options.constructor === Object), if options.adapter is set, we'll try to load it with the same mechanics
+   * - function: we'll create a new instance from that function, and pass the options object
+   */ 
+  constructor(options, defaultAdapter) {
+
+    // Use the default by default
+    let adapter;
+
+    // We have options and options have adapter key
+    if (options) {
+      // Pass an adapter as a module name, a function or an instance
+      if (typeof options == "string" || typeof options == "function" || options.constructor != Object) {
+        adapter = options;
+      }
+      if (options.adapter) {
+        adapter = options.adapter;
+      }
+    }
+    
+    if (!adapter) {
+      adapter = defaultAdapter;
+    }
+
+    // This is a string, require the module
+    if (typeof adapter === "string") {
+      adapter = require(adapter);
+      // If it's define as a module, get the default
+      if (adapter.default) {
+        adapter = adapter.default;
+      }
+    }
+    // From there it's either a function or an object
+    // if it's an function, instanciate and pass the options 
+    if (typeof adapter === "function") {
+      var Adapter = adapter;
+      adapter = new Adapter(options);
+    }
+
+    this.adapter = adapter;
+    this.options = options;
+  }
+}
+
+export default AdaptableController;