Add IE11 support

Match IE by looking for either "MSIE" or "Trident"
Read the new "rv:x.y" version number

src/bowser.js

@@ -9,6 +9,7 @@
     * Opera:   "Opera/9.80 (Macintosh; Intel Mac OS X 10.6.7; U; en) Presto/2.7.62 Version/11.01"
     * Safari:  "Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_7; en-us) AppleWebKit/533.21.1 (KHTML, like Gecko) Version/5.0.5 Safari/533.21.1"
     * IE:      "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C)"
+    * IE>=11:  "Mozilla/5.0 (Windows NT 6.3; WOW64; Trident/7.0; .NET4.0E; .NET4.0C; Media Center PC 6.0; rv:11.0) like Gecko"
     * Firefox: "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:2.0) Gecko/20100101 Firefox/4.0"
     * iPhone:  "Mozilla/5.0 (iPhone Simulator; U; CPU iPhone OS 4_3_2 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8H7 Safari/6533.18.5"
     * iPad:    "Mozilla/5.0 (iPad; U; CPU OS 4_3_2 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8H7 Safari/6533.18.5",
@@ -18,7 +19,7 @@
 
   var ua = navigator.userAgent
     , t = true
-    , ie = /msie/i.test(ua)
+    , ie = /(msie|trident)/i.test(ua)
     , chrome = /chrome/i.test(ua)
     , safari = /safari/i.test(ua) && !chrome
     , iphone = /iphone/i.test(ua)
@@ -36,7 +37,7 @@
 
     if (ie) return {
         msie: t
-      , version: ua.match(/msie (\d+(\.\d+)?);/i)[1]
+      , version: ua.match(/(msie |rv:)(\d+(\.\d+)?)/i)[2]
     }
     if (chrome) return {
         webkit: t