add search by filename and file content feature
add gf alias for git flow
add some alias for git flow
Merge remote-tracking branch 'robbyrussell/master'
set default value `--max-count=10`
Merge remote-tracking branch 'robbyrussell/master'
Merge remote-tracking branch 'robbyrussell/master'
Merge pull request #1840 from yleo77/master

About gf alias