Update JGit to 4.1.1.201511131810-r
Update JGit to 4.1.1.201511131810-r

This release fixes the bug
https://bugs.eclipse.org/bugs/show_bug.cgi?id=478865
"exactRef behaves differently in InMemoryRepository when HEAD is linked
to a non-existent ref"

Change-Id: Iced94eeec58f51b981821d55c65b5c1a2ad26db4
Signed-off-by: Matthias Sohn <446760a3fbea85cd5f8f4f5c3de304fe3a38014f@sap.com>

qtproject/qtqa-gerrit,GerritCodeReview/gerrit,MerritCR/merrit,MerritCR/merrit,gerrit-review/gerrit,WANdisco/gerrit,MerritCR/merrit,gerrit-review/gerrit,MerritCR/merrit,gerrit-review/gerrit,GerritCodeReview/gerrit,WANdisco/gerrit,joshuawilson/merrit,qtproject/qtqa-gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,qtproject/qtqa-gerrit,joshuawilson/merrit,WANdisco/gerrit,qtproject/qtqa-gerrit,joshuawilson/merrit,WANdisco/gerrit,gerrit-review/gerrit,MerritCR/merrit,gerrit-review/gerrit,qtproject/qtqa-gerrit,joshuawilson/merrit,joshuawilson/merrit,MerritCR/merrit,WANdisco/gerrit,MerritCR/merrit,joshuawilson/merrit,qtproject/qtqa-gerrit,GerritCodeReview/gerrit,joshuawilson/merrit,WANdisco/gerrit,gerrit-review/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,qtproject/qtqa-gerrit,WANdisco/gerrit,MerritCR/merrit,joshuawilson/merrit,GerritCodeReview/gerrit,gerrit-review/gerrit