Merge branch 'sp/misccleanup'

Merge branch 'sp/misccleanup'

* sp/misccleanup:
  Teach NB how to encode/decode an unsigned 16 bit integer
  Add a TreeWalk iterator implementation for IContainer
  Expose idBuffer,idOffset in AbstractTreeIterator to applications
  Expose the current entry's length, last modified in WorkingTreeIterator
  Allow WorkingTreeIterator to track last modified time for entries
  Add getTree to TreeWalk for locating the current iterator instance
  Allow WorkingTreeIterators to define their prefix path when created
  Allow AbstractTreeIterator subclasses to supply their own path array
  Notify AbstractTreeIterator implementations of skipped tree entries
  Add test case for the RevCommit parsing code
  Fix RawParseUtils.endOfParagraph to work on all corner cases