Add extra processing on nodeName.
Add extra processing on nodeName.

if the nodeName contains a '_', use the first thing before the '_', and
store the original nodeName in options.id.

Rename mkPipe to mkStage.

dglazkov/tree-builder-builder,loyso/tree-builder-builder,chunmun/tree-builder-builder,chunmun/tree-builder-builder,dglazkov/tree-builder-builder,loyso/tree-builder-builder,loyso/tree-builder-builder,dglazkov/tree-builder-builder,chunmun/tree-builder-builder