Log Message:
Update to 0.29.1. From Jonathan Buschmann in PR 49719.

-- 0.29.1 8 feb. 2015

New file extension detection
Possible speed up on BSD-derived platforms, during filename filtering
Add --[no]filename
Standardize some options (e.g. --line-numbers and --no-numbers are now --[no]numbers)
More fixes for --only-matching
Add --one-device doesn't follow links to other devices
Add Vala file type
Probably 99% of ignores are in the root directory, optimize this case
Option -v/--invert-match turn off colors
Various fixes

-- 0.28 25 dec. 2014

Set processor affinity for worker threads, may result in 3-5% performance \ 
improvement for certain systems
Add Mercury file type
Support for -o (--only-matching)
Allow multiple file types at the same time
Allow unlimited depth
Add -F/--fixed-strings to be more compatible with 'grep' usage
Add extensions for OCaml files
Fix exit code
Fix bash completion

-- 0.27 15 nov. 2014

Search stdin if stdin is a regular file
Add --count/-c to count matches
Add -0 and --print0 options
Add Liquid filetype
Add Markdown support