Browsified node-wot examples use old test Things URLs

[danielpeintner]

• index points to https://github.com/eclipse-thingweb/node-wot/blob/456ce93bef99781c56e3878a965274e44857e5d2/examples/browser/index.html#L30 and should be pointing to http://plugfest.thingweb.io/http-data-schema-thing
• counter points to https://github.com/eclipse-thingweb/node-wot/blob/456ce93bef99781c56e3878a965274e44857e5d2/examples/browser/counter.html#L47 and should be pointing to TBD
• smart-coffee-machine points to https://github.com/eclipse-thingweb/node-wot/blob/456ce93bef99781c56e3878a965274e44857e5d2/examples/browser/smart-coffee-machine.html#L59 and should be pointing to http://plugfest.thingweb.io/http-advanced-coffee-machine ??