MINOR Replaced INSTALL, UPGRADING and ChangeLog files with a more consistent README

ChangeLog

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-For a full change log, please visit http://open.silverstripe.org/wiki/ChangeLog.

INSTALL

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-Thanks for downloading SilverStripe CMS.
-
-Simply extract the archive to a folder in a web-accessible location and visit the folder
-in your web browser (which in turn runs index.php). 
-
-This will lead you through a web-based installation process.
-
-Server Requirements
-  * PHP 5.0.4+ (5.2+ is recommended)
-  * MySQL 4.1+ (other databases are supported - details here: http://doc.silverstripe.com/doku.php?id=server-requirements)
-  * Apache or IIS 7.x
-  * More information on server requirements here: http://doc.silverstripe.com/doku.php?id=server-requirements
-
-General documentation, tutorials: 
-  * Wiki: http://doc.silverstripe.com/
-  * Tutorials: http://doc.silverstripe.org/doku.php?id=tutorials
-
-Forum
-  * http://www.silverstripe.com/silverstripe-forum/

README.md

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+## Overview
+
+Base project folder for a SilverStripe ([http://silverstripe.org](http://silverstripe.org)) installation. Requires additional modules to function:
+
+ * [`sapphire`](http://github.com/silverstripe/sapphire): Module including the base framework
+ * [`cms`](http://github.com/silverstripe/silverstripe-cms): Module including a Content Management System
+ * `themes/blackcandy` (optional)
+
+## Server Requirements ##
+
+See [doc.silverstripe.org](http://doc.silverstripe.org/sapphire/en/installation/server-requirements)
+
+## Installation ##
+
+See [installation on different platforms](http://doc.silverstripe.org/sapphire/en/installation/),
+and [installation from source](http://doc.silverstripe.org/sapphire/en/installation/from-source).
+
+## Links ##
+
+ * [Changelogs](http://doc.silverstripe.org/sapphire/en/changelogs/)
+ * [Bugtracker](http://open.silverstripe.org)
+ * [Forums](http://silverstripe.org/forums)
+ * [Developer Mailinglist](https://groups.google.com/forum/#!forum/silverstripe-dev)
+
+## License ##
+
+	Copyright (c) 2007-2011, SilverStripe Limited - www.silverstripe.com
+	All rights reserved.
+
+	Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
+
+	    * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
+	    * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the 
+	      documentation and/or other materials provided with the distribution.
+	    * Neither the name of SilverStripe nor the names of its contributors may be used to endorse or promote products derived from this software 
+	      without specific prior written permission.
+
+	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
+	IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 
+	LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 
+	GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 
+	STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 
+	OF SUCH DAMAGE.

UPGRADING

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-Usually upgrading your SilverStripe installation just means overwriting files
-and updating your database-schema.
-
-  - Backup your database
-  - Backup your webroot
-  - Download the new release and uncompress it to a temporary folder
-  - With these folders: cms, sapphire, googlesitemaps
-      - Delete your existing folders
-      - Extract and replace folders from your download (leave modules
-        and your custom directories alone)
-      - Moving your current folders (rather than installing on top) means
-        you can undo the installation, and ensures if the new release has no
-        longer contains some files, these files won't be left behind, which otherwise
-        could cause bugs.
-      - Visit http://your.silverstripe.site/dev/build (This adds new
-        fields/tables to the database, and empties your template cache)
-  - Check if any modules (e.g. blog or forum) in your installation are compatible
-    and need to be upgraded as well
-  - Check if you need to adapt your code to changed APIs, see
-    http://doc.silverstripe.com/doku.php?id=upgrading