feat(build runner): added in context, dockerfile_location

this is a new feature meant to allow people to use any file as
  a dockerfile and any folder as a context directory

static/js/directives/ui/context-path-select/context-path-select.component.spec.ts

@@ -0,0 +1,87 @@
+import { ContextPathSelectComponent } from './context-path-select.component';
+
+
+describe("ContextPathSelectComponent", () => {
+  var component: ContextPathSelectComponent;
+  var currentContext: string;
+  var isValidContext: boolean;
+  var contexts: string[];
+
+  beforeEach(() => {
+    component = new ContextPathSelectComponent();
+    currentContext = '/';
+    isValidContext = false;
+    contexts = ['/'];
+    component.currentContext = currentContext;
+    component.isValidContext = isValidContext;
+    component.contexts = contexts;
+  });
+
+  describe("$onChanges", () => {
+
+    it("sets valid context flag to true if current context is valid", () => {
+      component.$onChanges({});
+
+      expect(component.isValidContext).toBe(true);
+    });
+
+    it("sets valid context flag to false if current context is invalid", () => {
+      component.currentContext = "asdfdsf";
+      component.$onChanges({});
+
+      expect(component.isValidContext).toBe(false);
+    });
+  });
+
+  describe("setcontext", () => {
+    var newContext: string;
+
+    beforeEach(() => {
+      newContext = '/conf';
+    });
+
+    it("sets current context to given context", () => {
+      component.setContext(newContext);
+
+      expect(component.currentContext).toEqual(newContext);
+    });
+
+    it("sets valid context flag to true if given context is valid", () => {
+      component.setContext(newContext);
+
+      expect(component.isValidContext).toBe(true);
+    });
+
+    it("sets valid context flag to false if given context is invalid", () => {
+      component.setContext("asdfsadfs");
+
+      expect(component.isValidContext).toBe(false);
+    });
+  });
+
+  describe("setCurrentcontext", () => {
+    var context: string;
+
+    beforeEach(() => {
+      context = '/conf';
+    });
+
+    it("sets current context to given context", () => {
+      component.setSelectedContext(context);
+
+      expect(component.currentContext).toEqual(context);
+    });
+
+    it("sets valid context flag to true if given context is valid", () => {
+      component.setSelectedContext(context);
+
+      expect(component.isValidContext).toBe(true);
+    });
+
+    it("sets valid context flag to false if given context is invalid", () => {
+      component.setSelectedContext("a;lskjdf;ldsa");
+
+      expect(component.isValidContext).toBe(false);
+    });
+  });
+});