Brandur c301c6c0f6 Add question mark helpers (e.g. #paid?) for boolean object values
This patch adds question marks helpers (e.g. #paid?) for any values in a
StripeObject that are a boolean. This is fairly idiomatic Ruby in that
it behaves similarly to other libraries like ActiveRecord.

Note that a caveat here is that nullable booleans will not get a helper
added for them if their current value is null. For this reason, we
should eventually prefer to derive these methods from some sort of
programmatic API manifest.

Replaces #257 and #274.
2015-09-30 13:48:59 -07:00
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