contrib: remove gitview

gitview did not have meaningful contributions since 2007, which gives the
impression it is either a mature or dead project.

In both cases we should not carry it in git.git as the README for contrib
states we only want to carry experimental things to give early exposure.

Recently a security vulnerability was reported by Javantea, so the decision
to either fix the issue or remove the code in question becomes a bit
more urgent.

Reported-by: Javantea <jvoss@altsci.com>
Signed-off-by: Stefan Beller <sbeller@google.com>
Acked-by: Aneesh Kumar K.V <aneesh.kumar@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

contrib/gitview/gitview.txt

@@ -1,57 +0,0 @@
-gitview(1)
-==========
-
-NAME
-----
-gitview - A GTK based repository browser for git
-
-SYNOPSIS
---------
-[verse]
-'gitview' [options] [args]
-
-DESCRIPTION
----------
-
-Dependencies:
-
-* Python 2.4
-* PyGTK 2.8 or later
-* PyCairo 1.0 or later
-
-OPTIONS
--------
---without-diff::
-
-	If the user doesn't want to list the commit diffs in the main window.
-	This may speed up the repository browsing.
-
-<args>::
-
-	All the valid option for linkgit:git-rev-list[1].
-
-Key Bindings
-------------
-F4::
-	To maximize the window
-
-F5::
-	To reread references.
-
-F11::
-	Full screen
-
-F12::
-	Leave full screen
-
-EXAMPLES
---------
-
-gitview v2.6.12.. include/scsi drivers/scsi::
-
-	Show as the changes since version v2.6.12 that changed any file in the
-	include/scsi or drivers/scsi subdirectories
-
-gitview --since=2.weeks.ago::
-
-	Show the changes during the last two weeks