Conditionally install packages on travis-CI
Update the scan-build line for the PACKAGES change as well.

It's better to keep the code consistent, even when it's commented
out.
Merge pull request #5 from rillian/travis-fup

Update the scan-build line for the PACKAGES change as well.
Merge pull request #393 from caitp/travis-fup

Conditionally install packages on travis-CI