Use Angular CLI instead of ngm for building

Some commands:

npm run build      - to build the library.  Output is in dist/ng2-file-upload/.
npm run test       - to run tests.  Coverage report is in coverage/ as before.
npm run demo.serve - to build demo application and serve it through browsersync
npm run start      - to run demo application using `ng serve`.  Requires the library to be built and linked first.

test/matchers.ts

@@ -0,0 +1,21 @@
+// tslint:disable
+/**
+ * @copyright Angular ng-bootstrap team
+ */
+beforeEach(() => {
+  jasmine.addMatchers({
+    toHaveCssClass(/*util, customEqualityTests*/) {
+      return {compare: buildError(false), negativeCompare: buildError(true)};
+
+      function buildError(isNot) {
+        return function (actual, className) {
+          const orNot = isNot ? 'not ' : '';
+          return {
+            pass: actual.classList.contains(className) === !isNot,
+            message: `Expected ${actual.outerHTML} ${orNot} to contain the CSS class "${className}"`
+          };
+        };
+      }
+    }
+  });
+});