Batch edit now uses Bootstrap grid rather than HTML table. This fixes th...

...e scrollbar issue when editing field details. The links for details have also been fixed so that the text and the chevron icon show/hide details

The following screenshots show how the layout looks now (no ugly horizontal scroll bars when editing details) and it scales nicely when screen is narrow.

![screen shot 2014-08-04 at 9 43 26 am](https://cloud.githubusercontent.com/assets/568286/3797992/b3f1bece-1bdf-11e4-93ba-6d2e2385c84b.png)
![screen shot 2014-08-04 at 9 43 09 am](https://cloud.githubusercontent.com/assets/568286/3797993/b3f2dcc8-1bdf-11e4-91c0-0e6559fd0491.png)
 
This line should be in `batch_edit_init` so that it'll work with turbolinks.