Remove debian directory upon the Debian's request

Makefile.am is also modified to get rid of debian words.

BUG=ibus#1945
R=Shawn.P.Huang@gmail.com, osamu.aoki@gmail.com, shawn.p.huang@gmail.com

Review URL: https://codereview.appspot.com/322670043

Makefile.am

@@ -134,48 +134,6 @@ srpm: dist @PACKAGE_NAME@.spec
 			--define "_specdir `pwd`/rpm" \
 			@PACKAGE_NAME@.spec
 
-.PHONY: debian/changelog
-debian/changelog:
-	$(AM_V_GEN) \
-	( \
-		. /etc/lsb-release; \
-		date=`date -R`; \
-		version=@VERSION@; \
-		serie=$(serie); \
-		if test -z "$$serie"; then \
-		  serie=$$DISTRIB_CODENAME; \
-		fi; \
-		if test -z "$$release"; then \
-		  release=1; \
-		fi; \
-		s=`cat debian/changelog.in`; \
-		eval "echo \"$${s}\""; \
-	) > $@
-
-ppa: dist debian/changelog
-	$(AM_V_GEN) \
-	( \
-		mkdir ppa; \
-		cd ppa; \
-		tar zxvf ../$(distdir).tar.gz ; \
-		cd $(distdir); \
-		cp -a ../../debian . ; \
-		cd debian; \
-		debuild -S -sa ; \
-	)
-
-dpkg: dist debian/changelog
-	$(AM_V_GEN) \
-	( \
-		mkdir ppa; \
-		cd ppa; \
-		tar zxvf ../$(distdir).tar.gz ; \
-		cd $(distdir); \
-		cp -a ../../debian . ; \
-		cd debian; \
-		debuild -b -us -uc; \
-	)
-
 clean-rpm:
 	$(RM) -r "`uname -i`"