PromiseKit 6.18.1

PromiseKit 6.18.0

PromiseKit 6.17.1

PromiseKit 6.17.0

PromiseKit 6.16.3

Merge pull request mxcl#1276 from RomanPodymov/feature/race_tests

RaceTests.m + handle empty input in PMKRace and PMKRaceFulfilled

PromiseKit 6.16.1

Merge pull request mxcl#1269 from RomanPodymov/feature/race_fulfilled

func race(fulfilled:) for Objective-C

Fix compile issues

Merge pull request mxcl#1223 from mxcl/v7-rc

--warnings; reduce deploy targets as poss