Represents stat information as presented by git at the end of a merge. It is
created from the output of a diff operation.
``Example``::
c = Commit( sha1 )
s = c.stats
s.total # full-stat-dict
s.files # dict( filepath : stat-dict )
``stat-dict``
A dictionary with the following keys and values::
deletions = number of deleted lines as int
insertions = number of inserted lines as int
lines = total number of lines changed as int, or deletions + insertions
``full-stat-dict``
In addition to the items in the stat-dict, it features additional information::
files = number of changed files as int