Add `is_target_root` in export

Review Request #4030 — Created June 28, 2016 and submitted — Latest diff uploaded

wisechengyi
pants
3610
4032
pants-reviews
benjyw, nhoward_tw, peiyu, stuhood, zundel

To reconstruct the build graph for import/indexing optimization, intellij pants plugin would need to know where roots start in the graph.

https://travis-ci.org/pantsbuild/pants/builds/140961443

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