remove unnecessary HostsFile include
isolate core HostsFile module code into its own class
remove redundant config argument from Updater initializer
extract Updater class into its own file
migrate UpdateHost action to use Updater class
migrate UpdateGuest action to use Updater class
migrate provisioner to use Updater class
migrate UpdateAll action to use Updater class and remove hosts_file.rb
Merge pull request #98 from pbitty/refactor_module

migrate HostsFile code into its own class