Add check_process_count feature

This check allows to validate if number of processes are running that are being expected
convert ppa:username/reponame to apt_line_uri

accept `ppa:launchpad-username/reponame` style with ppa checking methods
refactor #to_apt_line_uri

use String#sub to replace /^ppa:/ to ''
simplify.
Merge pull request #121 from cosmo0920/convert-apt-line

convert ppa:username/reponame to apt_line_uri
Merge pull request #119 from electrical/feature/proc_num

Add check_process_count feature
Tiny fix
Bump up version
Add openSUSE support
Merge pull request #122 from electrical/opensuse

Add openSUSE support
Bump up version
add command_prefix