Backed out changeset 8df19e23b3ae (bug 875289) because it depends on bug 884279 which I'm backing out
Backed out changeset c1596bee956c (bug 884279) because of build bustage

--HG--
rename : dom/promise/Promise.cpp => dom/future/Future.cpp
rename : dom/promise/Promise.h => dom/future/Future.h
rename : dom/promise/PromiseCallback.cpp => dom/future/FutureCallback.cpp
rename : dom/promise/PromiseCallback.h => dom/future/FutureCallback.h
rename : dom/promise/PromiseResolver.cpp => dom/future/FutureResolver.cpp
rename : dom/promise/PromiseResolver.h => dom/future/FutureResolver.h
rename : dom/promise/Makefile.in => dom/future/Makefile.in
rename : dom/promise/moz.build => dom/future/moz.build
rename : dom/promise/tests/Makefile.in => dom/future/tests/Makefile.in
rename : dom/promise/tests/moz.build => dom/future/tests/moz.build
rename : dom/promise/tests/test_promise.html => dom/future/tests/test_future.html
rename : dom/promise/tests/test_resolve.html => dom/future/tests/test_resolve.html
rename : dom/webidl/Promise.webidl => dom/webidl/Future.webidl