a few changes in fish_prompt and hgrc (hopefully they make hg stat faster)

Signed-off-by: Pooria Azimi <pooriaazimi@me.com>
add hggit extenstioon

Signed-off-by: Pooria Azimi <pooriaazimi@me.com>
much, much, much faster prompt in hg repositories

Signed-off-by: Pooria Azimi <pooriaazimi@me.com>
fix a few problems with fish_prompt

Signed-off-by: Pooria Azimi <pooriaazimi@me.com>
fix global gitignore

Signed-off-by: Pooria Azimi <pooriaazimi@me.com>