Fix mixing of bracket and non-bracket continuations

[odcinek]

Address #17

[AndrewRadev]

I've pushed your fix, although I'm kind of nervous about it. I can't help but think there will be some odd edge cases, and this particular issue seems like an edge case itself to me.

For starters, this example does not indent correctly:

response == "OK" or
  response == "1) menu item" or
 response == "2) menu item"

The reason is that, while s:Match checks whether the match is on a string, it can only check the beginning and end of the match (checking the entire body of the string would be too much work). As a result, the match was failing in the case of a ) in a string. I've fixed this in e36da34, but I can't help but think there will be more problems like this. If something like that happens, I'll revert the commits and open discussion here, to see what we can do.

In any case, thank you for your work!