Add implmentation of git index.
Add implmentation of git index.

It maintains the index of file status in the git repo.

2947721120/chromedeveditor,valmzetvn/chromedeveditor,devoncarew/spark,beaufortfrancois/chromedeveditor,hxddh/chromedeveditor,vivalaralstin/chromedeveditor,yikaraman/chromedeveditor,googlearchive/chromedeveditor,yikaraman/chromedeveditor,b0dh1sattva/chromedeveditor,2947721120/chromedeveditor,beaufortfrancois/chromedeveditor,2947721120/choredev,2947721120/chromedeveditor,hxddh/chromedeveditor,beaufortfrancois/chromedeveditor,vivalaralstin/chromedeveditor,modulexcite/chromedeveditor,modulexcite/chromedeveditor,b0dh1sattva/chromedeveditor,b0dh1sattva/chromedeveditor,hxddh/chromedeveditor,vivalaralstin/chromedeveditor,ussuri/chromedeveditor,beaufortfrancois/chromedeveditor,devoncarew/spark,modulexcite/chromedeveditor,valmzetvn/chromedeveditor,2947721120/chromedeveditor,googlearchive/chromedeveditor,devoncarew/spark,ussuri/chromedeveditor,beaufortfrancois/chromedeveditor,vivalaralstin/chromedeveditor,vivalaralstin/chromedeveditor,modulexcite/chromedeveditor,2947721120/chromedeveditor,yikaraman/chromedeveditor,googlearchive/chromedeveditor,modulexcite/chromedeveditor,googlearchive/chromedeveditor,googlearchive/chromedeveditor,hxddh/chromedeveditor,ussuri/chromedeveditor,beaufortfrancois/chromedeveditor,2947721120/chromedeveditor,ussuri/chromedeveditor,devoncarew/spark,valmzetvn/chromedeveditor,ussuri/chromedeveditor,modulexcite/chromedeveditor,b0dh1sattva/chromedeveditor,yikaraman/chromedeveditor,yikaraman/chromedeveditor,2947721120/choredev,valmzetvn/chromedeveditor,googlearchive/chromedeveditor,2947721120/choredev,hxddh/chromedeveditor,valmzetvn/chromedeveditor,2947721120/choredev,2947721120/chromedeveditor,valmzetvn/chromedeveditor,b0dh1sattva/chromedeveditor,yikaraman/chromedeveditor,vivalaralstin/chromedeveditor,2947721120/choredev,2947721120/choredev,devoncarew/spark,devoncarew/spark,beaufortfrancois/chromedeveditor,b0dh1sattva/chromedeveditor,b0dh1sattva/chromedeveditor,valmzetvn/chromedeveditor,hxddh/chromedeveditor,ussuri/chromedeveditor,modulexcite/chromedeveditor,2947721120/choredev,vivalaralstin/chromedeveditor,ussuri/chromedeveditor,googlearchive/chromedeveditor,yikaraman/chromedeveditor,hxddh/chromedeveditor