Refactor to use install command

Remove install lines

gnupg.rb : update to version 2.2.2

Update freetype from 2.8-1 to 2.8.1

Update libtasn1 from 4.10-2 to 4.12

Add kotlin package

Add irssi package

irssi is a console IRC client with perl scripting support.

Tested as working on Samsung Chromebook Plus (aarch64).

Update libx264 from 20170604-2245-stable to 20171118-2245-stable

Add pulseaudio package

Add alsa_lib and alsa_plugins packages

Add cmus package

Add jfrog package

Add gb package

Add google_cloud_sdk package

Add vagrant package

Add chruby package

Update lvm2 from 2.02.174 to 2.02.176

Add cgroupfs_mount package

Downgrade bashdb package

Update byobu from 5.119 to 5.123

Update nano from 2.8.7 to 2.9.0

This is a bugfix and maintenance release.

Tested as working on Samsung Chromebook Plus (aarch64).

Add zlibpkg dependency to ag package

Update libslz from 1.1.0-1 to 1.1.0-2

Update libvorbis from 1.3.3 to 1.3.5

Update autoconf_archive from 2017-03-21 to 2017-09-28

Update nettle from 3.3 to 3.4

Add CONTRIBUTING.md

Add Learn more section

Fix egghead.io link

Highlight buttons, controls and badges

Bold the buttons, controls and badges

Correct step sequences

Update libogg from 1.3.1 to 1.3.3