Git versions with commit 7f814632f5d4d7af9f4225ece6039dbc44e03079 print the
stat summary output slightly different. There were two changes that affect
GitStats:

a) Singular forms of files/insertions/deletions may be used
b) The number of counts is now variable ranging from 1 to 3:
   1: only files changed if file count is 0
   2: if either insertions or deletions are 0 (not if both are)
   3: where files,insertions and deletions are >0
          or both insertions and deletions are  0

Signed-off-by: Heikki Hokkanen <hoxu@users.sf.net>