Merge branch 'develop' of github.com:sleuthkit/sleuthkit into 6971-dataModelTests

bindings/java/src/org/sleuthkit/datamodel/AbstractFile.java

...java/src/org/sleuthkit/datamodel/CaseDatabaseFactory.java

...va/src/org/sleuthkit/datamodel/CommunicationsManager.java

bindings/java/src/org/sleuthkit/datamodel/DerivedFile.java

bindings/java/src/org/sleuthkit/datamodel/Directory.java

bindings/java/src/org/sleuthkit/datamodel/File.java

bindings/java/src/org/sleuthkit/datamodel/FsContent.java

bindings/java/src/org/sleuthkit/datamodel/HashUtility.java

bindings/java/src/org/sleuthkit/datamodel/LayoutFile.java

...ings/java/src/org/sleuthkit/datamodel/LocalDirectory.java

bindings/java/src/org/sleuthkit/datamodel/LocalFile.java

...ava/src/org/sleuthkit/datamodel/LocalFilesDataSource.java

bindings/java/src/org/sleuthkit/datamodel/SlackFile.java

bindings/java/src/org/sleuthkit/datamodel/SleuthkitCase.java

...gs/java/src/org/sleuthkit/datamodel/SpecialDirectory.java

...ngs/java/src/org/sleuthkit/datamodel/TskCaseDbBridge.java

...gs/java/src/org/sleuthkit/datamodel/VirtualDirectory.java

tools/fiwalk/src/arff.cpp

travis_install_libs.sh

tsk/auto/tsk_db.h