Travis: adding clang to build configuration#44

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fmilthaler wants to merge 3 commits intomasterfrom

travis-add-clang

Commits on Jun 8, 2015

Travis: adding clang to build configuration
Frank Milthaler
committed
Avoid overwriting CXX compiler with MPI wraper; only add GNU specific compiler options when using GNU.
Frank Milthaler
committed

Commits on May 10, 2016

Merge with master
ggorman
committed