CustomSkulls 0.2

Added messages to /skulls give command.
Added /skulls give command to the help command.
Added plugin.yml to the repo.
Added description to the plugin.yml file.
Added more packages to keep the project organized.
Merged PermissionsManager and PermissionsSystemType together.
Changed /skulls give command example when wrong values are entered.
Changed version number back to 0.2.