added DSL methods to generate List Views
add CONTRIBUTING.md.
Merge pull request #146 from sheehan/contributing

add CONTRIBUTING.md.
added a section about code style
CRLF at the end of a file
Update DownstreamContext.groovy

'SUCCESS', 'UNSTABLE' and 'FAILURE' were wrongly mapped to 48, 49 and 50 (ascii values of '0', '1' and '2'). Now the threshold names are mapped to their actual integer value instead of their ascii value.
Merge pull request #107 from jenkinsci/views

Views
added default parameters for filterBuildQueue and filterExecutors
added support for Build Pipeline plugin
added BuildPipelineView
Fix publisher tests

Fixed test to check against integer instead of ascii values.
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)
Add support for envInject Step & Wrapper