Update to JGit 4.0.1

James Moger

2015-06-28 a909bf1333d9e9bcdc5e87a17642211e6fa8f036

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[submodule "src/main/distrib/data/gitignore"]
    path = src/main/distrib/data/gitignore
    url = https://github.com/github/gitignore.git