Added geoa contrib module for geoalchemy2 integration

Still needs docs and tests
update translations to fix localization errors
Moved tests/sqlamodel to tests/sqla
Added test for geoa
Added documentation for geoa module
Merge pull request #708 from singingwolfboy/geoa

Added geoa contrib module for Geoalchemy2 integration
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