ARMORY-150 - Review and correct new armoryd code

Completely overhauled the armoryd help command, allowing armoryd to pass
back far more information about each armoryd function. Also added more
text to the relevant function docstrings, although most of the text is
just meant to be placeholders. The text will be fixed later.
Merge branch 'devel' of github.com:etotheipi/BitcoinArmory into devel