raxml: Build a bottle for Linuxbrew

[sjackman]

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[sjackman]

Travis on Mac:

==> brew test homebrew/science/raxml --verbose
Testing homebrew/science/raxml
==> Using the sandbox
/usr/bin/sandbox-exec -f /tmp/homebrew20160603-3973-k5zgd2.sb /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby -W0 -I /usr/local/Library/Homebrew -- /usr/local/Library/Homebrew/test.rb /usr/local/Library/Taps/homebrew/homebrew-science/raxml.rb --verbose
==> raxmlHPC-PTHREADS -f a -m GTRGAMMA -p 12345 -x 12345 -N 100 -s aln.phy -n test -T 2
Error: homebrew/science/raxml: failed
execution expired

https://travis-ci.org/Linuxbrew/homebrew-science/jobs/134956474#L233