feat(animate): adds basic support for CSS animations on enter and leave

Closes #3876

modules/angular2/src/animate/css_animation_options.ts

@@ -0,0 +1,22 @@
+export class CssAnimationOptions {
+  /** initial styles for the element */
+  fromStyles: StringMap<string, any>;
+
+  /** destination styles for the element */
+  toStyles: StringMap<string, any>;
+
+  /** classes to be added to the element */
+  classesToAdd: string[] = [];
+
+  /** classes to be removed from the element */
+  classesToRemove: string[] = [];
+
+  /** classes to be added for the duration of the animation */
+  animationClasses: string[] = [];
+
+  /** override the duration of the animation (in milliseconds) */
+  duration: number;
+
+  /** override the transition delay (in milliseconds) */
+  delay: number;
+}