Log Message:
Changes 1.7.8.4:
* The code to look up attributes for paths reused entries from a wrong
  directory when two paths in question are in adjacent directories and
  the name of the one directory is a prefix of the other.
* A wildcard that matches deeper hierarchy given to the "diff-index" \ 
command,
  e.g. "git diff-index HEAD -- '*.txt'", incorrectly reported additions of
  matching files even when there is no change.
* When producing a "thin pack" (primarily used in bundles and smart
  HTTP transfers) out of a fully packed repository, we unnecessarily
  avoided sending recent objects as a delta against objects we know
  the other side has.
* "git send-email" did not properly treat sendemail.multiedit as a
  boolean (e.g. setting it to "false" did not turn it off).
* Also contains minor fixes and documentation updates.