Prevents duplicate accounts. Also allows case insensitive search (user id, salt seed, etc) while still having an index. This is done by storing normalized as a separate field from originally formated (which we'll use for sending emails, etc).
A few things at once because it was faster to get a demo out the door. Skipping most test implementation though I made failing stubs so I know what to fill in later.
* Get/Post WalletState
* downloadKey/email so that a second client can log in, and/or recover from lost client
* Test client in Python to demonstrate the above
* Organize into packages
