Auto-insert build-status img into readme.

Author: sideshowbarker

Makefile

@@ -5,6 +5,7 @@ FMT=fmt
 FMTFLAGS=-80
 EXPAND=expand
 EXPANDFLAGS=
+BUILDSTATUS=\[\!\[Build Status\]\(http://goo.gl/b6xEQs\)\]\(http://goo.gl/ehNisw)
 
 all: README.md
 
@@ -18,4 +19,5 @@ README.md: index.html
 	    | $(FMT) $(FMTFLAGS) \
 	    | $(PERL) $(PERLFLAGS) -pe 'undef $$/; s/ +(\[[0-9]+\]:)\s+/\n   $$1 /g' \
 	    | $(PERL) $(PERLFLAGS) -pe 'undef $$/; s/(\n\n\n)+/\n\n/g' \
+	    | $(PERL) $(PERLFLAGS) -pe 's|(# The Nu Markup Checker \(v.Nu\))|$$1 $(BUILDSTATUS)|g' \
 	    | $(EXPAND) $(EXPANDFLAGS) > $@