Tag Management

[allmightyspiff]

Some new tagging functionality is live now ( softlayer/softlayer.github.io#166 )
so I think it would be good to add this to the CLI.

Rough idea of commands to write:

slcli tags

• search
  • show all tags with that name
• delete <tagName|id>
• list <all|attached|unattached>
• details <tagName|id>
  • Should show the tag, and anything with that tag.
• setTags
• types
• taggable
  • list out all objects of Type that are taggable, somehow.