Included:
- Added Installation Instructions for Slackware
- Fix for Gentoo's instruction on wget
- Small changes for Void

Add terminal font detection support for terminology

As 'grep -B' is a GNU extension, a more portable solution is preferable. The most direct and simple solution would be using 'awk':

    awk '/^font.name$/{print a}{a=$0}'

But a sed solution could also be applied:

    sed -n '/^font\.name$/{g;1!p;};h'

Support for terminology font name detection is based on the terminology config file. This file is always located here: `~/.config/terminology/config/standard/base.cfg` (https://github.com/billiob/terminology/blob/30cb65625bfa3b9030b80308d76ec2f30b62bd02/src/bin/config.c#L216) and is in a data/binary format. The only way I found (beside coding a dedicated extractor) is to use `strings`. The font name seems to be placed right before the `font.name` string.

    strings ~/.config/terminology/config/standard/base.cfg | grep -B1 font.name | head -1

Here are results that could be output:

    $ strings ~/.config/terminology/config/standard/base.cfg | grep -B1 font.name | head -1
    6x13.pcf
    --> (for a bitmap font) and with another font selected
    $ strings ~/.config/terminology/config/standard/base.cfg | grep -B1 font.name | head -1
    Inconsolata:style=Regular

These results are easily "parseable" in order to extract the font name for display.

improved refresh_rate fix, now actually works on OS X...

fixed refresh rate on OS X

Add support for macOS Sierra

New installation instruction for Gentoo/Funtoo

Fix CPU Usage