Git 2.1.1

1. 7b64d42 hashmap: add string interning API by Karsten Blees · 11 years ago
2. ab73a9d hashmap: add simplified hashmap_get_from_hash() API by Karsten Blees · 11 years ago
3. e8fa59b test-hashmap.c: drop unnecessary #includes by Jonathan Nieder · 12 years ago
4. efc6842 remove old hash.[ch] implementation by Karsten Blees · 12 years ago
5. 6a364ce add a hashtable implementation that supports O(1) removal by Karsten Blees · 12 years ago