v0.5.2

Split Ticket Service & Client

This is a beta release of the split ticket buyer service and client. Please
read the instructions for joining the beta.

Mac Release

Provided by @girino.

Changelog for version 0.5.2

• Update dependencies to latest version
• Add fee validation tests and voting pool fee validation in buyer
• Add a small overhead to test for available funds before starting session in
  buyer
• Add --version command line argument to buyer and service
• Fix waiting list watcher
• Allow MaxWaitTime to be zero in buyer, allowing a client to wait forever in
  queue
• Add keepalive parameters to both buyer and service daemon, to allow better
  detection of stalled connections
• Add websocket waiting list service and example page to allow voting pools to
  more easily show waiting sessions to users
• Automatically initialize config on GUI buyer when there is a single decrediton
  and voting pool configured in the machine
• Add log capabilities to buyer (both CLI and GUI)