ARMORY-185 ARMORY-194

Multiple changes rolled into one handy, dandy delivery.

-Added a warning to armoryd, stating that armoryd is still in beta and
is potentially in flux as a result.
-Fixed importprivkey() in armoryd.
-Changed the return value in signasciitransaction() in armoryd from a
string to a dictionary.
-Fixed a minor regex issue when putting together the help dictionary.
-Made a couple of internal functions more consistent when returning
values.
-Minor comment and variable name clarification and cleanup.
Merge branch 'devel' of github.com:etotheipi/BitcoinArmory into devel