RFR: 49: Add forwarder bot

[Erik Duveblad via github.com]

The pull request has been updated with additional changes.

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Added commits:
 - bd25de8d:	Use shared storage for forwarder bot

Pull request:
https://git.openjdk.java.net/skara/pull/40

Webrevs:
 - full: https://webrevs.openjdk.java.net/skara/40/webrev.01
 - inc: https://webrevs.openjdk.java.net/skara/40/webrev.00-01

Updated full patch:
https://git.openjdk.java.net/skara/pull/40.diff

Fetch command:
git fetch https://git.openjdk.java.net/skara pull/40/head:pull/40