added some style options for sortable tables.
added some style options for sortable tables.

dimagi/rapidsms,unicefuganda/edtrac,ken-muturi/rapidsms,rapidsms/rapidsms-core-dev,lsgunth/rapidsms,eHealthAfrica/rapidsms,unicefuganda/edtrac,peterayeni/rapidsms,ken-muturi/rapidsms,caktus/rapidsms,dimagi/rapidsms-core-dev,unicefuganda/edtrac,lsgunth/rapidsms,catalpainternational/rapidsms,peterayeni/rapidsms,catalpainternational/rapidsms,ken-muturi/rapidsms,caktus/rapidsms,ehealthafrica-ci/rapidsms,peterayeni/rapidsms,eHealthAfrica/rapidsms,peterayeni/rapidsms,lsgunth/rapidsms,dimagi/rapidsms,ehealthafrica-ci/rapidsms,catalpainternational/rapidsms,lsgunth/rapidsms,caktus/rapidsms,rapidsms/rapidsms-core-dev,catalpainternational/rapidsms,eHealthAfrica/rapidsms,ehealthafrica-ci/rapidsms,dimagi/rapidsms-core-dev