chore(build): ng2 style guide applied,

- build process updated
- systemjs bundler added

BREAKING CHANGES:
- directives and selectors renamed to ng2FileSelect and ng2FileDrop

components/file-upload/file-drop.directive.ts

@@ -0,0 +1,89 @@
+import { Directive, EventEmitter, ElementRef, HostListener, Input, Output } from '@angular/core';
+
+import { FileUploader } from './file-uploader.class';
+
+@Directive({selector: '[ng2FileDrop]'})
+export class FileDropDirective {
+  @Input() public uploader:FileUploader;
+  @Output() public fileOver:EventEmitter<any> = new EventEmitter();
+
+  private element:ElementRef;
+  public constructor(element:ElementRef) {
+    this.element = element;
+  }
+
+  public getOptions():any {
+    return this.uploader.options;
+  }
+
+  public getFilters():any {
+    return {};
+  }
+
+  @HostListener('drop', ['$event'])
+  public onDrop(event:any):void {
+    let transfer = this._getTransfer(event);
+    if (!transfer) {
+      return;
+    }
+
+    let options = this.getOptions();
+    let filters = this.getFilters();
+    this._preventAndStop(event);
+    this.uploader.addToQueue(transfer.files, options, filters);
+    this.fileOver.emit(false);
+  }
+
+  @HostListener('dragover', ['$event'])
+  public onDragOver(event:any):void {
+    let transfer = this._getTransfer(event);
+    if (!this._haveFiles(transfer.types)) {
+      return;
+    }
+
+    transfer.dropEffect = 'copy';
+    this._preventAndStop(event);
+    this.fileOver.emit(true);
+  }
+
+  @HostListener('dragleave', ['$event'])
+  public onDragLeave(event:any):any {
+    if (event.currentTarget === (this as any).element[0]) {
+      return;
+    }
+
+    this._preventAndStop(event);
+    this.fileOver.emit(false);
+  }
+
+  private _getTransfer(event:any):any {
+    return event.dataTransfer ? event.dataTransfer : event.originalEvent.dataTransfer; // jQuery fix;
+  }
+
+  private _preventAndStop(event:any):any {
+    event.preventDefault();
+    event.stopPropagation();
+  }
+
+  private _haveFiles(types:any):any {
+    if (!types) {
+      return false;
+    }
+
+    if (types.indexOf) {
+      return types.indexOf('Files') !== -1;
+    } else if (types.contains) {
+      return types.contains('Files');
+    } else {
+      return false;
+    }
+  }
+/*
+  _addOverClass(item:any):any {
+    item.addOverClass();
+  }
+
+  _removeOverClass(item:any):any {
+    item.removeOverClass();
+  }*/
+}