fix position bugs,support touch event

Author: sandywalker

HISTORY.md

@@ -1,5 +1,14 @@
 # History
 
+### 2015-11-04
+* make the  animation avaiable for hidding.
+* add new trigger:'sticky'.
+* remove the option:constrains, move the value 'horizontal/vertical' to placement.
 
+### 2015-11-05
+
+* fix the bug which caused the  popover can't be closed on mobile device.
+* new way to init popover content, set the content by next element html which has class 'webui-popover'.
+* optimese the calulate position  algorithm.
+* update the demo page adapt for mobile device.
 
-> **TODO:** Check commit history and add the rest.