Add 'get_by_tag' method to quotes_gateway
Update README
Add get_by_tag to quotes_gateway_backend
Revert "Add 'get_by_tag' method to quotes_gateway"

This reverts commit 4b23c1a558aba79ba28b25bde5b96a9c43441c3e.
Revert "Add get_by_tag to quotes_gateway_backend"

This reverts commit 821338f14e8ae4e81ab51076f436bac805fc8f51.
Revert "Update README"

This reverts commit d886ab45867b5fd625fa8e28a7b99ccd0ecc3073.