(#747) - Disable chrome tests in travis

Something has changed on saucelabs which breaks chrome, disabling
them temporarily
(#739) - remove complicated not used code from bulk_docs
(#738) - report error when no _rev

When bulk_docs with new_edits and no _rev then we have
to report error to our users. Previously Pouch just crashed
(#747) Tests failing - adding scrolling to tests on saucelabs to see the actual output
Enable Opera