Enhancement to auto complete current path

Enhancement to auto complete current path, https://github.com/FredrikNoren/ungit/issues/37

Uses custom jquery-ui and get rest API to get all directories in current path and allow users to select on the go.

![screen shot 2013-09-05 at 18 10 51](https://f.cloud.github.com/assets/5281068/1092506/71b3d502-1680-11e3-90cb-d5f985cfec35.png)