[V28] Update source of Spidermonkey in Firefox v28
[v28] Adds building scripts for all platforms.
[v28] Add ios.m4.
[v28] Add support for iOS in configure.in.
[v28] Update configure with autoconf213
[v28] Patch for NumericConversions.h.
[v28] Patch for TypeDecls.h.
[v28] Update build.sh
[v28] Add arm64 architecture in double-conversion
[v28] Fix a problem in autoconf that ios_arch for simulator is forced to i386
[v28] Update configure
[v28] Delete makefile and autoconf.mk to avoid gmake issue
[v28] Add build64.sh to build-ios
[v28] Compare original sources and cleanup
[v28] Update configure with autoconf213
[v28] Reverse changes to JS_THREADSAFE
[v28] JS_THREADSAFE fallbacks to the original value
[v28] Fix a bug for win32/android build
Merge branch 'master' of https://github.com/ricardoquesada/Spidermonkey

Conflicts:
	js/src/build-ios/build64.sh
	js/src/configure
Merge branch 'master' into v28