Bump to Lucene 5.2.1

Luca Milanesio

2015-09-09 e618eb051246e7941dc2964a5038587c9d45d1d2

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