Add a single-process option to pom-resolve
Add a single-process option to pom-resolve

I always have to adjust this by comment/uncomment
when I need to debug classpath, which is ridiculous.

(sapling split of eaac0111441b8fbfa5a07d235b2bd05cd6054a93)
foursquare/fsqio,foursquare/fsqio,foursquare/fsqio,foursquare/fsqio,foursquare/fsqio