[Rev 03] RFR: Create forges from service providers

[Robin Westberg]

The pull request has been updated with additional changes.

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

Added commits:
 - 84f37fab: Improve error handling

Changes:
  - all: https://git.openjdk.java.net/skara/pull/223/files
  - new: https://git.openjdk.java.net/skara/pull/223/files/2e2e1eff..84f37fab

Webrevs:
 - full: https://webrevs.openjdk.java.net/skara/223/webrev.03
 - incr: https://webrevs.openjdk.java.net/skara/223/webrev.02-03

  Stats: 121 lines in 8 files changed: 51 ins; 7 del; 63 mod
  Patch: https://git.openjdk.java.net/skara/pull/223.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/223/head:pull/223

PR: https://git.openjdk.java.net/skara/pull/223