Merge branch 'develop' into cp2k-psmp

* develop: (174 commits)
  also test with Lmod as modules tool on Travis
  fix style
  remove Rust easyconfig using intel toolchain, rustc doesn't work
  also install python-graph-dot
  install python-graph-core library required by easyconfig tests
  set $PYTHONPATH
  fix typo
  query GitHub for commit ID of framework/easyblocks branch being used
  remove faulty PIL easyconfig
  make dev version PEP440 compliant
  add easyconfig i-PI-1.0-20160213-intel-2016a-Python-2.7.11.eb
  modify easyconfig PIL-1.1.7-intel-2016a-Python-2.7.11.eb
  Fix failing FSL on RHEL 7
  add test configuration for Travis
  stick to freetype 2.6.2 for compatibility with matplotlib 1.5.1
  add easyconfig PIL-1.1.7-intel-2016a-Python-%(ppyver)s.eb
  usempi is not required for numexpr
  fix path in sanity checks
  modify easyconfig PIL-1.1.7-intel-2016a-Python-2.7.11.eb
  modify easyconfig numexpr-2.5.2-intel-2016a-Python-2.7.11.eb
  ...