Fixing Giraph pom.xml to reflect new project committers

Summary:
Fixed the list of project committers. Please review your information and let me know if I should change anything.

This will be the first diff that I'll be committing all by myself, more like a test to see my username is gone through Apache's internal :-)

Test Plan: N/A

Reviewers: ikabiljo, pavanka, avery.ching, sergey.edunov

Reviewed By: sergey.edunov

Differential Revision: https://reviews.facebook.net/D61197
1 file changed