Add easyblock for libint2
More features in libint2 easyblock
pick up  if it's set
make sure license file spec passed via  is used and ends up in saved .eb file
correctly set license_file easyconfig param
Merge pull request #243 from boegel/intel_license_file

pick up $INTEL_LICENSE_FILE if it's set
Merge pull request #236 from tovrstra/libint2

Add easyblock for libint2
Merge branch 'develop' into rosetta