(TravisCI) Manually install elasticsearch 0.90.13
Implement "Become User" functionality
Change oae-rest branch to become-user
Add indication in log when a user is impostered
(BecomeUser) Review followup
(BecomeUser) Filter HTTP headers when logging
soffice binary default is soffice not soffice.bin
Merge pull request #880 from mrvisser/travisci-elasticsearch-0.90.13

(TravisCI) Manually install elasticsearch 0.90.13
Merge pull request #881 from stuartf/soffice.what

soffice binary default is soffice not soffice.bin
Improve image JPG conversion logging
Merge pull request #875 from mrvisser/become-user

(BecomeUser) Implement "become user" functionality
Pointing oae-rest to oaeproject's github rather than mrvisser's.
Merge pull request #882 from mrvisser/improve-image-conversion-logging

Improve image JPG conversion logging