add back .gitignored files

civicrm/bower_components/angular-bootstrap/.gitignore

civicrm/bower_components/angular-file-upload/.gitignore

civicrm/bower_components/font-awesome/.gitignore

civicrm/bower_components/jquery-ui/.gitignore

civicrm/bower_components/jquery/.gitignore

civicrm/bower_components/js-yaml/.gitignore

civicrm/bower_components/select2/.gitignore

civicrm/packages/.gitignore

civicrm/vendor/adrienrn/php-mimetyper/.gitignore

...endor/adrienrn/php-mimetyper/node_modules/mime-db/db.json

civicrm/vendor/cache/integration-tests/.gitignore

civicrm/vendor/cache/tag-interop/.gitignore

civicrm/vendor/civicrm/civicrm-cxn-rpc/.gitignore

civicrm/vendor/civicrm/composer-downloads-plugin/.gitignore

civicrm/vendor/cweagans/composer-patches/.gitignore

civicrm/vendor/dflydev/apache-mime-types/.gitignore

civicrm/vendor/marcj/topsort/.gitignore

civicrm/vendor/pear/auth_sasl/.gitignore

civicrm/vendor/pear/console_getopt/.gitignore

civicrm/vendor/pear/log/.gitignore