Add pom.xml parser
Add pom.xml parser

This doesn't do transitive dependencies yet, but it parses a pom.xml file and
turns it into a WORKSPACE file.

--
MOS_MIGRATED_REVID=95305450

davidzchen/bazel-website,davidzchen/bazel-website,bazelbuild/bazel-website,bazelbuild/bazel-website,davidzchen/bazel-website,davidzchen/bazel-website,bazelbuild/bazel-website