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

spec/AdaptableController.spec.js

@@ -0,0 +1,68 @@
+
+var AdaptableController = require("../src/Controllers/AdaptableController").AdaptableController;
+var FilesAdapter = require("../src/Adapters/Files/FilesAdapter").default;
+
+describe("AdaptableController", ()=>{
+    
+  it("should instantiate an adapter from string in object", (done) => {
+    var adapterPath = require('path').resolve("./spec/MockAdapter");
+    var controller = new AdaptableController({
+      adapter: adapterPath,
+      key: "value", 
+      foo: "bar"
+    });
+    
+    expect(controller.adapter instanceof Object).toBe(true);
+    expect(controller.options.key).toBe("value");
+    expect(controller.options.foo).toBe("bar");
+    expect(controller.adapter.options.key).toBe("value");
+    expect(controller.adapter.options.foo).toBe("bar");
+    done();
+  });
+  
+  it("should instantiate an adapter from string", (done) => {
+    var adapterPath = require('path').resolve("./spec/MockAdapter");
+    var controller = new AdaptableController(adapterPath);
+    
+    expect(controller.adapter instanceof Object).toBe(true);
+    done();
+  });
+  
+  it("should instantiate an adapter from string that is module", (done) => {
+    var adapterPath = require('path').resolve("./src/Adapters/Files/FilesAdapter");
+    var controller = new AdaptableController({
+      adapter: adapterPath
+    });
+    
+    expect(controller.adapter instanceof FilesAdapter).toBe(true);
+    done();
+  });
+  
+  it("should instantiate an adapter from function/Class", (done) => {
+    var controller = new AdaptableController({
+      adapter: FilesAdapter
+    });
+    expect(controller.adapter instanceof FilesAdapter).toBe(true);
+    done();
+  });
+  
+  it("should instantiate the default adapter from Class", (done) => {
+    var controller = new AdaptableController(null, FilesAdapter);
+    expect(controller.adapter instanceof FilesAdapter).toBe(true);
+    done();
+  });
+  
+  it("should use the default adapter", (done) => {
+    var adapter = new FilesAdapter();
+    var controller = new AdaptableController(null, adapter);
+    expect(controller.adapter).toBe(adapter);
+    done();
+  });
+  
+  it("should use the provided adapter", (done) => {
+    var adapter = new FilesAdapter();
+    var controller = new AdaptableController(adapter);
+    expect(controller.adapter).toBe(adapter);
+    done();
+  });
+});