New upstream version 4.4

.github/ISSUE_TEMPLATE/bug_report.md

.gitignore

.travis.yml

CHANGELOG.md

ISSUE_TEMPLATE.md

README.md

java-diff-utils-jgit/nb-configuration.xml

java-diff-utils-jgit/pom.xml

...java/com/github/difflib/algorithm/jgit/HistogramDiff.java

.../com/github/difflib/algorithm/jgit/HistogramDiffTest.java

...om/github/difflib/algorithm/jgit/LRHistogramDiffTest.java

...ff-utils-jgit/src/test/resources/mocks/large_dataset1.zip

java-diff-utils/pom.xml

...iff-utils/src/main/java/com/github/difflib/DiffUtils.java

...ls/src/main/java/com/github/difflib/UnifiedDiffUtils.java

...ls/src/main/java/com/github/difflib/algorithm/Change.java

...ain/java/com/github/difflib/algorithm/DiffAlgorithmI.java

...a/com/github/difflib/algorithm/DiffAlgorithmListener.java

...main/java/com/github/difflib/algorithm/DiffException.java

...hub/difflib/algorithm/DifferentiationFailedException.java