add a func for git ahead/behind prompt
add a func for git ahead/behind prompt

articuluxe/harmsway,articuluxe/harmsway,danrharms/harmsway,articuluxe/harmsway,articuluxe/harmsway,articuluxe/harmsway,danrharms/harmsway,danrharms/harmsway,articuluxe/harmsway,articuluxe/harmsway,danrharms/harmsway,danrharms/harmsway,danrharms/harmsway,articuluxe/harmsway