Minor improvements to repository documentation

* Change the README to use Markdown syntax. (Which it pretty much did already.)
* Add suffixes to README and COPYING.

Author: andrewschleifer

COPYING renamed to COPYING.txt

@@ -1,15 +1,15 @@
 GitX
----------------
+----
 
-# What is GitX?
+## What is GitX?
 
 GitX is a gitk like clone written specifically for OS X Leopard and higher.
 This means that it has a native interface and tries to integrate with the
 operating system as good as possible. Examples of this are drag and drop
 support and QuickLook support.
 
 
-# Features
+## Features
 
 The project is currently still in its starting phases. As time goes on,
 hopefully more features will be added. Currently GitX supports the following:
@@ -21,11 +21,11 @@ hopefully more features will be added. Currently GitX supports the following:
     * Preview any file in the tree in a text view or with QuickLook
     * Drag and drop files out of the tree view to copy them to your system
    * Support for all parameters git rev-list has
-# License
+## License
 
 GitX is licensed under the GPL version 2. For more information, see the attached COPYING file.
 
-# Downloading
+## Downloading
 
 GitX is currently hosted at GitHub. It's project page can be found at
 http://github.com/pieter/gitx. Recent binary releases can be found at
@@ -36,7 +36,7 @@ through git:
 
   git clone git://github.com/pieter/gitx
 
-# Installation
+## Installation
 
 The easiest way to get GitX running is to download the binary release from the
 wiki. If you wish to compile it yourself, you will need XCode 3.0 or later. As
@@ -45,7 +45,7 @@ collection), you will not be able to compile it on previous versions of OS X.
 
 To compile GitX, open the GitX.xcodeproj file and hit "Build".
 
-# Usage
+## Usage
 
 GitX itself is fairly simple. Most of its power is in the 'gitx' binary, which
 you should install through the menu. the 'gitx' binary supports most of git
@@ -55,7 +55,7 @@ relating to the 'Documentation' subdirectory. With `gitx -Shaha', gitx will
 only show commits that contain the word 'haha'. Similarly, with 'gitx
 v0.2.1..', you will get a list of all commits since version 0.2.1.
 
-# Helping out
+## Helping out
 
 Any help on GitX is welcome. GitX is programmed in Objective-C, but even if
 you are not a programmer you can do useful things. A short selection: