don't spread build finalization in too many places
use yamerl
add 'make sh'
add yamerl as dependency
add command prefix in build process
add lxc.erl and kha_cont_lxc
finish lxc container
update exmpp
update readme and add a script to install erlang dependencies in a new container
delete obsolete code
properly finalize lxc container
add kha_cont:exec/3
fix out of container file exists check
improve code reuse
initial config fetching code
implement kha_config_archive
fetch pending steps upon builder startup
fix bug with ignoring errors in steps
finalize config fetching from github and using 'git archive' trick
fix bug with steps containing && or ;