Merge branch 'tg/index-v4-format'

* tg/index-v4-format: read-cache: add index.version config variable test-lib: allow setting the index format version introduce GIT_INDEX_VERSION environment variable

Junio C Hamano committed Mar 14, 2014 at 14:26 UTC 13b49f1e7463c46272c0b3b9b1952dc519086b6d

No changes.