allow going alone

[bmchrist]

[bmchrist]

when selecting trump -- addtl prompt to go alone

if going alone - set "alone"

at end of hand, reset alone state along with other "round values" (todo -- should we group those to more easily set them -- eg make them all part of their own class so we know that always gets reset each hand? -- made issue #58 to consider this)

during round:
when incrementing who is next, skip the player opposite trump selector

when scoring, check for alone and use