Integrated: pr: align handleCommit and handle

[Erik Helin]

Hi all,

please review this patch that aligns `handleCommit` and `handle` in  `CommandHandler`. This gives handlers for commit commands access to the commit, a census instance, etc.

Testing:
- [x] `make test` passes on Linux x64

Thanks,
Erik

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Commit messages:
 - forge: align handleCommit and handle

Changes: https://git.openjdk.java.net/skara/pull/926/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=926&range=00
  Stats: 45 lines in 5 files changed: 24 ins; 4 del; 17 mod
  Patch: https://git.openjdk.java.net/skara/pull/926.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/926/head:pull/926

PR: https://git.openjdk.java.net/skara/pull/926