Wallet docs: link to github.io not google code
Fix Orchid deadlock 3

https://github.com/subgraph/Orchid/pull/10
Orchid: fix NPE when unbuilt circuit is closed
Extension of java.text.Format for locale-sensitive Bitcoin value formatting & parsing.
Fix or comment out a few Java 7isms.
Overload Script.getToAddress() with a variant that tries harder to determine a destination address.

I ended up duplicating this piece of code several times, so I thought it may be useful to have it in the framework.

Includes tests.
Signers: map derivation paths to scriptPubKeys..

.. instead of TransactionInput objects since latter are mutable.
Orchid: fix infinite task creation loop when shutting down
Orchid: better thread tracking

also, fix race condition in closing circuits on shutdown
Orchid: document an issue with pending circuits on shutdown