[ADF-1672] Start Process - Improve the look and feel (#2437)

* [DW-180]  Start Process - Improve the look and feel.

* Created custom-button directive to have custom buttons inside the form.
* Updated en.json.
* Refactored start-process component.
* Added a property showEventIcon in start-form component.

* [DW-180] Start Process - Improve the look and feel.

* Refactored start-process scss file.
* Added some scss class to the html in start process/form components.
* Updated en.json.
* Added  ViewEncapsulation none.

* [ADF-1672] Start Process - Improve the look and feel .

* Removed Event icon.

ng2-components/ng2-activiti-form/src/components/form-custom-button.directive.ts

@@ -0,0 +1,20 @@
+/*!
+ * @license
+ * Copyright 2016 Alfresco Software, Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { Directive } from '@angular/core';
+
+@Directive({ selector: '[form-custom-button]' }) export class StartFormCustomButtonDirective {}