added support for Build Pipeline plugin
added BuildPipelineView
Make Steps work within groovy categories
When wrapping a step in a groovy Category, then calling private methods
in the super-class (AbstractStepContext)
from public methods fail. Protected works, so here I changed all private
methods to protected.
Add some tests
Add complete support for environment variables (EnvInject)
Merge pull request #153 from wolfs/fix-categories

Make Steps work within groovy categories
Merge pull request #150 from CoreMedia/build-pipeline-trigger

Support for Build Pipeline Plugin
Add properties to maven Closure
Merge pull request #155 from wolfs/maven

Add properties to maven Closure
Merge pull request #154 from wolfs/env-inject

Add complete support for environment variables (EnvInject)