RFR: 8: Use a file based approach for GitToHgConverter.java

[Erik Duveblad via github.com]

Hi,

this patch introduces a file based approach for `GitToHgConverter` (instead of interpreting diffs). This is much more stable solution, we do not have to handle different encodings etc. Successfully converted the jfx repo from git to hg (and a bunch of smaller ones like jmc, code-tools/*, etc).

Thanks,
Erik

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Commits:
 - 7b3a05e6:	8: Use a file based approach for GitToHgConverter.java

Pull request:
https://git.openjdk.java.net/skara/pull/110

Webrev:
https://webrevs.openjdk.java.net/skara/110/webrev.00

Patch:
https://git.openjdk.java.net/skara/pull/110.diff

Fetch command:
git fetch https://git.openjdk.java.net/skara pull/110/head:pull/110