Change style of select state of filter button

When a filter is selected the filter button is in a different visual state. I initially used the .btn-info class, but I've replaced it with the .btn-primary class.

Signed-off-by: Belen <belenbarrospena@gmail.com>
Adding filter modal dialogs

I've added the filters for those columns that will have them. Filters use the modal Twitter Bootstrap component and the tooltip component for the selected state.

Signed-off-by: Belen <belenbarrospena@gmail.com>