travis: Switch from raring to saucy

raring has been removed from the mirrors and was no longer supported
Merge pull request #1218 from rleigh-dundee/travis-saucy

travis: Switch from raring to saucy
Update auto-generated documentation

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

Generated by BIOFORMATS-5.1-latest-docs-autogen#104 (http://ci.openmicroscopy.org/job/BIOFORMATS-5.1-latest-docs-autogen/104/)