Support empty object

* Now you can enter empty object {  }
* Fix a localLog timestamp bug
* Change issue report from code.google.com to github
Plugins menu & search collections with keyword

* Add plugins menu to topbar
* Now you can search collections with keyword in the left bar
Fix bugs

* Fix "null" value in update box and insert box
* Improve search box in left bar
Merge pull request #1 from iwind/master

Sync with origin