Updated Travis to run against CouchDB 1.7.1 and Python 3.6

[emlaver]

• Updated COUCHDB_VERSION variable to just contain version number
• Get couchdb node name from _membership only if CouchDB version is 2.1.1
• Updated tests to support CouchDB 1.7.x
• Added helper method to check what version
• Removed javascript validation test that doesn’t apply to CouchDB 1.7.1

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• [x] Tick to sign-off your agreement to the Developer Certificate of Origin (DCO) 1.1
• [x] You have added tests for any code changes
• [x] You have updated the CHANGES.md
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What

Added CouchDB 1.7.1 to travis test matrix and updated Python 3.5 env to 3.6.

How

• Updated logic to check if COUCHDB_VERSION starts with 1 for skipping tests when running against CouchDB 1.6.x and 1.7.x.
• Only get the CouchDB node name from _membership if CouchDB version is 2.1.1
• Added helper method to check if CouchDB version is 1.x

Testing

No new tests. Removed test_view_callable_with_invalid_javascript in view_tests.py as it's not valid in CouchDB 1.7.1.

281

[emlaver]

@smithsz @ricellis The skipIf tags needed to be fixed since they were skipping tests against CouchDB 1.7.x, and running CouchDB _db_updates on Cloudant which failed as expected. I’ve updated the tags and test logic in c4e880e. Cloudant and CouchDB 1.7.x are passing but 2 tests are failing that are related to IAM.