Factor dokku home directory out into an attribute, node['dokku']['root']
Rename plugins_dir attribute to plugin_path to match dokku's naming
Update README for new structure
Update prebuilt buildstack url attribute
Make cookbook version 0.2.0 to match dokku's version
Add sudo cookbook dependency to Berksfile
Add sudo cookbook dependency to metadata.rb
Add sudo LWRP matcher and rename docker matcher module
Remove installation of nginx-reloader script and add dokku to sudoers group
Updated Vagrantfile's box_url and added private IP.

In addition: moved 'lxc' related provision settings inside the lxc
provider block and slightly cleaned up code.