Fix build

Fix compilation error and project parent pom properties
The jclouds parent is intended for the jclouds projects (the ones that are part of jclouds), and the examples in this repo are not that case. They are just like any other client application, so I'd remove the parent from the pom.xml, keep the fixed 1.7.3 version, and also update the `jclouds.version` property.

Thanks for the cleanup @skrauchenia!