added "-q" back in to split out pip installs.

The -q was eliminated previously because travis kills the test if
it spends >=5 min without any output.  But each of the pip calls
seem to be <5 min, just *together* they take >5.
changed "OPTIONAL" to "OPTIONAL_DEPS"
Merge pull request #699 from eteq/travis-yml-split-optionals

Hide log for dependencies installs in travis