Fix 4.1 adapter under Rubinius

[chewi]

Calling return inside a block under Rubinius results in aLocalJumpError, at least with version 2.3.0. This is probably a Rubinius bug but it is easy enough to work around it here.

I am making the assumption that accept! will never return nil. Is that reasonable?

Unfortunately one other spec still fails but I don't think it's Squeel's fault. It's something to do with preloading HABTM associations, possibly caused by the Rubinius implementation of flat_map.

[ernie]

@bigxiang FWIW, I'm not a fan of merging these kinds of alternative-Ruby fixes if they're for a bug in the interpreter. The change here (calling break) is very odd-looking for standard Ruby, and would confuse people (it confused me when I saw it). But you're got the reins, now, so do as you will. ;)

[chewi]

each + break might have been slightly less confusing than find + break but each returns the array rather than nil when it reaches the end.

[chewi]

I've reported the issue to Rubinius at rubinius/rubinius#1312.