RFR: Add tool for importing webrev patches

[Jorn Vernee via github.com]

The pull request has been updated with additional changes.

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Added commits:
 - 3e72aabe:	Address review comments

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

Webrevs:
 - full: https://webrevs.openjdk.java.net/skara/32/webrev.07
 - inc: https://webrevs.openjdk.java.net/skara/32/webrev.06-07

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