preliminary JWT support for protocol v28
frustration
enable javascript in server config
update mocha
fix JWT / protocol 28 support
disable JWT tests on protocol versions prior to 28
Merge pull request #165 from codemix/jwt

Add support for token based authentication.
add Db.prototype.createUserContext(token)
fix tests on 1.7.10
Merge pull request #166 from codemix/add-createUserContext

add Db.prototype.createUserContext(token)
add further perf tests for deserializer [ci skip]
Merge pull request #167 from codemix/more-csv-perf-tests

add further perf tests for deserializer [ci skip]