Please pull gitk master branch

Junio,

Please do a pull from my gitk repository master branch to get the
following commits:

Christian Stimming (1):
      gitk: Update German translation.

Dirk Suesserott (1):
      gitk: Add option 'Simple history' to the options menu

Elijah Newren (1):
      gitk: Make more options easily accessible from Edit View dialog

Johannes Sixt (1):
      gitk: Use --textconv to generate diff text

Markus Heidelberg (1):
      gitk: Allow diff view without context lines

Michele Ballabio (1):
      gitk: Add another string to translation

Pat Thoyts (1):
      gitk: Handle msysGit version during version comparisons

Paul Mackerras (1):
      gitk: Check git version before using --textconv flag

Thanks,
Paul.