Change SHPlayerProtocol to SHPlayable.
Change NSOrderedSet to NSArray
Set order on participantsWithoutCurrentParticipant
Using NSArray instead of NSOrderedSet because... assholes. That's why.

Cleaned up the preloading selectors
Added SH_nextParticipantsInLine
Bump podspec
Merge branch 'release/0.6.0' into develop