Feature/#40 add llvm clang support to ci
Closes #40
Adds support for clang 4.0.1 for common and nightly builds (nightlies as soon as this is merged to master -> there are no feature schedules)
Closes #40
Adds support for clang 4.0.1 for common and nightly builds (nightlies as soon as this is merged to master -> there are no feature schedules)