Added 0.9.0 TwistedOakCollapsingFutures podspec

Added matchFirst/Last cancel token methods, fixed category methods on NSArray not being prefixed with toc_, shortened several overly long method/typedef names (renaming stops at 1.0 so I'm paying that breakage now).
Merge pull request #6260 from Strilanc/master

Added 0.9.0 TwistedOakCollapsingFutures podspec