Work on the card activities and comments

This commit also introduces a new CSSEvents object that is used to
abstract vendor specifics events related to CSS transitions and
animations.

Fixes #183.
Fixes #179.

client/lib/cssEvents.js

@@ -0,0 +1,42 @@
+// XXX Should we use something like Moderniz instead of our custom detector?
+
+var whichTransitionEvent = function() {
+  var t;
+  var el = document.createElement('fakeelement');
+  var transitions = {
+    transition:'transitionend',
+    OTransition:'oTransitionEnd',
+    MSTransition:'msTransitionEnd',
+    MozTransition:'transitionend',
+    WebkitTransition:'webkitTransitionEnd'
+  };
+
+  for (t in transitions) {
+    if (el.style[t] !== undefined) {
+      return transitions[t];
+    }
+  }
+};
+
+var whichAnimationEvent = function() {
+  var t;
+  var el = document.createElement('fakeelement');
+  var transitions = {
+    animation:'animationend',
+    OAnimation:'oAnimationEnd',
+    MSTransition:'msAnimationEnd',
+    MozAnimation:'animationend',
+    WebkitAnimation:'webkitAnimationEnd'
+  };
+
+  for (t in transitions) {
+    if (el.style[t] !== undefined) {
+      return transitions[t];
+    }
+  }
+};
+
+CSSEvents = {
+  transitionend: whichTransitionEvent(),
+  animationend: whichAnimationEvent()
+};