Add missing require to Rakefile

Use bundle exec to make manpage
Don't set executable bit on manpage

Makefile

@@ -85,13 +85,13 @@ docs/content/2.download/source/jq.tgz: jq
 tarball: docs/content/2.download/source/jq.tgz
 
 jq.1: docs/content/3.manual/manual.yml
-	( cd docs; rake manpage; ) > $@
+	( cd docs; bundle exec rake manpage; ) > $@
 
 install: jq jq.1
 	install -d -m 0755 $(prefix)/bin
 	install -m 0755 jq $(prefix)/bin
 	install -d -m 0755 $(mandir)/man1
-	install -m 0755 jq.1 $(mandir)/man1
+	install -m 0644 jq.1 $(mandir)/man1
 
 uninstall:
 	rm -vf $(prefix)/bin/jq

docs/Rakefile

@@ -4,6 +4,7 @@ require 'maruku'
 require 'json'
 require 'ronn'
 require 'tempfile'
+require 'yaml'
 
 module ExtraFilters
   def markdownify(input)