add GIT_DIR option when constructing core.excludes matchers
add GIT_DIR option when constructing core.excludes matchers

crisptrutski/boot,junjiemars/boot,junjiemars/boot,boot-clj/boot,RadicalZephyr/boot,kausdev/boot,instilled/boot,upgradingdave/boot,crisptrutski/boot,tobias/boot,kennyjwilli/boot,danielsz/boot,kausdev/boot,instilled/boot,tailrecursion/boot,ragnard/boot,kennyjwilli/boot,crisptrutski/boot,danielsz/boot,upgradingdave/boot,kausdev/boot,upgradingdave/boot,tobias/boot,bbatsov/boot,danielsz/boot,ragnard/boot,RadicalZephyr/boot,ragnard/boot,junjiemars/boot,tobias/boot