add 'in list' and 'empty' filters, allow changing to filters with opts, add versions to js filenames

fix between filters
upgrade to bootstrap 3.3.1
add select2-bootstrap-css for bootstrap3 styling fixes

use select2-bootstrap-css
fix backwards compatibility issues with new filters by not requiring 'select2' data_type for filters with options
add custom SQLA filter example
Merge pull request #711 from pawl/inlist_filter3

add 'in list' and 'empty' filters, allow changing to filters with options, add js versions, fix bootstrap3+select