Need lookup of devices based off name

[dankamongmen]

While #12 gives us fast lookup via index, we also need lookup based off device name. This ought be no more than log(n) and ideally o(1).

[dankamongmen]

I've added the name trie management. Now we need to:

• insert new ifaces into the name trie
• remove dead ifaces from the name trie

and this will be done!

[dankamongmen]

I've added unit tests for name lookup. They fail currently, as expected.

[dankamongmen]

We're now inserting into the name_trie. We just need to set up removal.