[JS] Added package.json for libjoynr
[JS] Added package.json for libjoynr

* package.json includes the devDependencies for karma

Change-Id: I9c0403ff89b7d25ab865c9a1799512afbce7d158

clive-jevons/joynr,clive-jevons/joynr,bmwcarit/joynr,clive-jevons/joynr,clive-jevons/joynr,bmwcarit/joynr,bmwcarit/joynr,clive-jevons/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,clive-jevons/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr