#25 [WIP] fix hierarchical tag handling and validate tag names

已合并

getty 于 4 年之前将 6 次代码提交从 getty/gdritter/tag-fixes合并至 getty/master

作者	SHA1 备注	提交日期
Getty Ritter	d6dab1d728 Be more lenient with what tag names can be	4 年之前
Getty Ritter	299e09b553 Automatic formatting commit: 2020-04-18T11:47:44.606778	4 年之前
Getty Ritter	09c37f38ba Add all hierarchical tags	4 年之前
Getty Ritter	6b2f10afb1 formatting	4 年之前
Getty Ritter	7847fb41b3 Tags can have slashes, too, as a treat	4 年之前
Getty Ritter	2a42bdbce2 Validate tag names as being alphanumeric	4 年之前