Fixes to previous commit
Fixes to previous commit

Require PEG only in the "parser" task -- it may not exist when executing
the "build" task. Also don't make the "build" task dependent on the
"parser" to break a dependency circle.

GerHobbelt/pegjs,pegjs/pegjs,Mingun/pegjs,crguezl/pegjs,pegjs/pegjs,jlturner/pegjs,luisvt/pegjs,GerHobbelt/pegjs,wwall/pegjs-fn,jlturner/pegjs,luisvt/pegjs,mcanthony/pegjs,crguezl/pegjs,mcanthony/pegjs,wwall/pegjs-fn,Mingun/pegjs,Sciumo/pegjs,Sciumo/pegjs