fix some reported issues
introducing initializer_list
make travis build on osx
force libc++ for clang
ask travis to build and install libc++
try Xcode build
try to install Xcode command line tools
brew update failed?
try clang on linux
add missing script
add apt-get clean
trying a solution from the web
updated build steps
Merge remote-tracking branch 'upstream/master'
rm questions document