Bump to JGit 4.0.0

Luca Milanesio

2015-06-12 a1cee65c7242f69f7e35978d98cea391095d7225

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