fontconfig is not cellar :any

From the bottle we see /usr/local

    $ strings -a libfontconfig.1.dylib | grep /usr/local
    /usr/local/etc/fonts
    /usr/local/var/cache/fontconfig

and in fact it can't find its config file with a non-/usr/local prefix.

Closes #25171.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
Add bash completion support for "brew switch"

First autocompletes on the names of installed packages and then
autocompletes on available versions for that specific package

Closes #25051.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
bottle: only chdir into the cellar when tarring up the bottle
doctor: fix PATH issues in comments

Closes #25170.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
xulrunner 26.0
slimerjs 0.9 + xulrunner dependency