Implement TemplateConfig endpoint

Adds TemplateProcessor implementation using the default
ExpressionValueGenerator, which is capable of transforming
Template api objects into Config api objects.

Authors:
  Michal Fojtik <mfojtik@redhat.com>
  Vojtech Vitek <vvitek@redhat.com>
Merge pull request #41 from mfojtik/templateConfig

Merged by openshift-bot