RFR: Add tool for importing webrev patches

[Jorn Vernee via github.com]

The pull request has been updated with additional changes.

----------------

Added commits:
 - 18f27687:	Address review comments

Pull request:
https://git.openjdk.java.net/skara/pull/32

Webrevs:
 - full: https://webrevs.openjdk.java.net/skara/32/webrev.08
 - inc: https://webrevs.openjdk.java.net/skara/32/webrev.07-08

Updated full patch:
https://git.openjdk.java.net/skara/pull/32.diff

Fetch command:
git fetch https://git.openjdk.java.net/skara pull/32/head:pull/32