Revert "travis: Build with OpenJDK8"

This reverts commit 40f7f18e7b246c28c7539e678bebc8fcdc0064dc.
Merge pull request #805 from sbesson/travis_fix

Revert "travis: Build with OpenJDK8"
Update auto-generated documentation

Repository: openmicroscopy/bioformats
Already up-to-date.

Generated by BIOFORMATS-docs-autogen-develop#120 (http://hudson.openmicroscopy.org.uk/job/BIOFORMATS-docs-autogen-develop/120/)