[Patternfly] Move to node 4 for building patternfly

[Brian Leathem]

Hello all,

Given that node 4 is now available both in Red Hat software collections [1]
and Openshift [2] what does everyone think about moving to node 4 as a
requirement for building patternfly?

This wouldn't affect project consuming patternfly, but rather only when one
is developing patternfly itself.

This change is triggerred by several patternfly dev-dependency updates
requiring newer node APIs.

Brian

[1]
http://developers.redhat.com/products/softwarecollections/get-started-rhel7-nodejs/
[2] https://github.com/sclorg/s2i-nodejs-container
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