hacking is now markdown

Not good markdown, mind you.

doc/include.am

@@ -39,13 +39,13 @@ EXTRA_DIST+= doc/asciidoc-helper.sh			\
              doc/state-contents.txt				\
              doc/torrc_format.txt 				\
 	     doc/TUNING						\
-	     doc/HACKING/README.1st				\
-	     doc/HACKING/CodingStandards.txt			\
-	     doc/HACKING/GettingStarted.txt			\
-	     doc/HACKING/HelpfulTools.txt			\
-	     doc/HACKING/HowToReview.txt 			\
-	     doc/HACKING/ReleasingTor.txt                       \
-	     doc/HACKING/WritingTests.txt
+	     doc/HACKING/README.1st.md				\
+	     doc/HACKING/CodingStandards.md 			\
+	     doc/HACKING/GettingStarted.md 			\
+	     doc/HACKING/HelpfulTools.md 			\
+	     doc/HACKING/HowToReview.md  			\
+	     doc/HACKING/ReleasingTor.md                        \
+	     doc/HACKING/WritingTests.md
 
 docdir = @docdir@