Merge branch 'js/rename'

Merge branch 'js/rename'

* js/rename:
  Implemented file path based tie breaking to exact rename detection
  Added more test cases for RenameDetector
  Added very small optimization to exact rename detection
  Fixed Misleading Javadoc
  Added file path similarity to scoring metric in rename detection
  Fixed potential div by zero bug
  Added file size based rename detection optimization
  Create FileHeader from DiffEntry
  log: Implement --follow
  Cache the diff configuration section
  log: Add whitespace ignore options
  Format submodule links during differences
  Redo DiffFormatter API to be easier to use
  log, diff: Add rename detection support
  Implement similarity based rename detection
  Added a preliminary version of rename detection
  Refactored code out of FileHeader to facilitate rename detection