ARMORY-125 - Improvements for armoryd

"Grab bag" commit with the following:

-Add more lockbox functionality (setactivelockbox).
-Add a default lockbox to the armoryd server.
-Modify getwalletinfo and getlockboxinfo calls to supply info based on
an incoming ID string.
-Fix minor documentation flubs.
Merge branch 'devel' of github.com:etotheipi/BitcoinArmory into devel