bashrc: add git prompt

Signed-off-by: Markus Lehtonen <markus.lehtonen@linux.intel.com>
bashrc: hide home directory from git

Define GIT_CEILING_DIRECTORIES so that user-configs in $HOME does not
interfere with other git projects.

Signed-off-by: Markus Lehtonen <markus.lehtonen@linux.intel.com>
xinitrc: setup dual screen with xrandr

Signed-off-by: Markus Lehtonen <markus.lehtonen@linux.intel.com>