Just pulling PGI up to develop#1

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rjeschmi wants to merge 4 commits intobartoldeman:pgifrom

Commits on Aug 7, 2015

Add PGI compiler toolchain.
bartoldeman
committed

Commits on Aug 8, 2015

Change copyright, add some comments.
bartoldeman
committed

Commits on Sep 2, 2015

Merge remote-tracking branch 'upstream/develop' into pgi
rjeschmi
committed

Commits on Dec 3, 2015

adding a new toolchain for pgi and mvapich
rjeschmi
committed