Add Vim help tags for abolish, coffee-script and yankring.

Change-Id: Idd5947eae2c82fce175f747a0dd565ca8c4d69d8
Signed-off-by: Wei-Chung Wen <morisato3711@gmail.com>
[Vim] Rename yankring history file.

Change-Id: I7fcfed5302d45880806638b44ec6f0d5957765c7
Signed-off-by: Wei-Chung Wen <morisato3711@gmail.com>