Fix build for Xcode6, iOS8

  - Add $(inherited) flag to OTHER_LINKER_FLAGS
  - Update to Kiwi 2.3, fixes Cocoapods XCTest import error
Travis fix attempt 1: Remove ONLY_ACTIVE_ARCH
Travis fix attempt 2: Specify ARCHS
Set archs == build settings
Specify simulator version
ACTIVE_ARCH=NO
Use arch i386