restore nexus-workflow block
include maven info for cleanGrails task

Conflicts:
	build.gradle
add grails.local.repo to cleanGrails task
parameterize grails central
define plugin dependencies in BuildConfig.groovy

Conflicts:
	rundeckapp/application.properties
restrict the grails code-coverage plugin to scope=test
Merge branch 'issue/1027-parameterize-grails-central' of https://github.com/onejli/rundeck into onejli-issue/1027-parameterize-grails-central

Conflicts:
	rundeckapp/grails-app/conf/BuildConfig.groovy
Merge branch 'onejli-issue/1027-parameterize-grails-central' into development