DC odds should be working during the come-out by default

[skent259]

As per Wikipedia:

Unlike come bets, the odds laid behind points established by Don't Come bets are always working including come out rolls unless the player specifies otherwise.

Related to #54, which seems to have introduced the bug, because it should only have applied to Come bets

[skent259]

Probably want an always_working argument for Place, Come, DontCome, Buy, Lay, and Put bets that can handle the logic appropriately and be more consistent throughout.