Simplify transitions into and through matches

[dmorrill10]

MatchStartController

• There should be exactly four actions: index, new, join, and rejoin.
• After any action other than index, there should always be a Match model at least partially created.
• The _wait_for_players_to_connect partial should be shown after (and only after) each action other than index. Everything to finish setting up the match should be done in this partial before calling PlayerActionsController#index.
• There must be at least one slice in the Match instance before calling PlayerActionsController#index

  #index

• Only creates a blank Match and provides the user with forms for the other match start actions.

  #new

• Must finish creating a Match instance from the user's submitted form
• Must have the TableManager (in this order):
  1. Spawn a dealer
  2. Spawn all automatic opponents
  3. Create a proxy and connect it to the dealer

     #join

• Must find the Match instance specified by the user specified match name and seat, then must create a new Match instance with identical properties except that the seat is changed
• Must then follow the same procedure as that followed by #rejoin after finding a match ID

  #rejoin

• Must find the Match instance specified by the user specified match name and seat and provide this ID to PlayerActionsController#index.
• Issues NO requests to TableManager

  PlayerActionsController

• Match must be completely set up and all players must be connected to the dealer before any action in this controller is called.

  #index

• Displays the first match slice regardless of how many are present in the Match instance. Does nothing else.

  #update

• Deletes the first match slice and displays the next one (restoring the previous slice if no other slice is present).
• Should only be called when there is a new slice to be displayed.