Log Message:
Update to 3.29:

3.29: 2015-09-02
 Now included: git aliases that allow git to work with action stamps.
 The new repomapper tool helps prepare contributor maps.
 Use of branchify/branchify_map is now less likely to produce invalid resets.
 branchify_map has been changed to handle subdirectories better.
 "branchify_map reset" actually works now.
 Prevent a crash on empty SVN comments produced by dumpfiltering.
 'assign' command with no selection set or arguments lists assignments.
 New --user-ignores option on Subversion reads passes through .gitignores.
 'repotool initialize' now generates an easier-to-read conversion makefile.