Add commit message snippet

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
Handle comment char, empty line, escape \t \r \n \\

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
Ship a sample commit message file: snippet.txt

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
Update documentation about commit message snippet

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
Fixed issue #1787: auto-complete label when writing commit message

Signed-off-by: Sven Strickroth <email@cs-ware.de>
Merge branch 'snippets'