Renamed documentation files to .txt and converted them to DOS line endings so they would open properly on all systems.

Updated Makefile.in so "make dist" includes everything necessary for release.

--HG--
rename : BUGS => BUGS.txt
rename : COPYING => COPYING.txt
rename : CREDITS => CREDITS.txt
rename : INSTALL => INSTALL.txt
rename : README.android => README-android.txt
rename : README.cmake => README-cmake.txt
rename : README.DirectFB => README-directfb.txt
rename : README.gesture => README-gesture.txt
rename : README.HG => README-hg.txt
rename : README.iOS => README-ios.txt
rename : README.MacOSX => README-macosx.txt
rename : README.pandora => README-pandora.txt
rename : README.Platforms => README-platforms.txt
rename : README.Porting => README-porting.txt
rename : README.psp => README-psp.txt
rename : README.touch => README-touch.txt
rename : README.WinCE => README-wince.txt
rename : README => README.txt
rename : TODO => TODO.txt

README-hg.txt

@@ -0,0 +1,23 @@
+The latest development version of SDL is available via Mercurial.
+ercurial allows you to get up-to-the-minute fixes and enhancements;
+as a developer works on a source tree, you can use "hg" to mirror that
+source tree instead of waiting for an official release. Please look
+at the Mercurial website ( http://mercurial.selenic.com/ ) for more
+information on using hg, where you can also download software for
+ac OS X, Windows, and Unix systems.
+
+  hg clone http://hg.libsdl.org/SDL
+
+If you are building SDL with an IDE, you will need to copy the file
+include/SDL_config.h.default to include/SDL_config.h before building.
+
+If you are building SDL via configure, you will need to run autogen.sh
+before running configure.
+
+There is a web interface to the subversion repository at:
+
+	http://hg.libsdl.org/SDL/
+
+There is an RSS feed available at that URL, for those that want to
+track commits in real time.
+