Convert svn:ignore properties to .gitignore.

.gitignore

+Makefile
+Makefile.in
+
+*.swp
+
+# /
+/dune-fem-dg-*.tar.gz
+/aclocal.m4
+/am
+/autom4te.cache
+/configure
+/config.guess
+/config.h
+/config.h.in
+/config.lt
+/config.status
+/config.sub
+/depcomp
+/dependencies.m4
+/dune-fem-dg.pc
+/install-sh
+/libtool
+/ltmain.sh
+/missing
+/stamp-h1
+/*.log
+/*.tmp
+/*.swp
+/.libs