moved changelog from forum post into separate file.

diff --git a/changelog.txt b/changelog.txt
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+Changelog
+---------
+
+2012-08-06:  Moved this changelog off the forum post and into a separate file.
+
+2012-08-05 (multiple updates): Rewrote pipeworks to use loops and tables to 
+create the nodes. Requires far less code now.  Made the empty/loaded indication 
+at the capped end more prominent.  Changed the default pipe segment to the 
+aforementioned "short centered" segment, renamed it to just "pipeworks:pipe" 
+(and pipe_loaded), added empty/loaded indicator images to the capped ends, 
+removed some redundant comments.  Added -X, +X, -Y, +Y, -Z, +Z capped stubs and 
+a short centered horizontal segment.
+
+2012-07-21: Added screenshot showing pipes as they look now that nodebox 
+texture rotation is fixed.
+
+2012-07-18: Changed the mod name and all internals to 'pipeworks' instead of 
+'pipes'... after a couple of mistakes :-)
+
+2012-07-12: moved project to github.
+
+2012-06-23: Initial release, followed by reworking the textures a bit.