Explicitly set permissions when running 'install'

The default permissions set by 'install' are 0755 which is not
what we want for manpages and the bash completion file.

Makefile

@@ -11,9 +11,9 @@ all:
 
 install:
 	@mkdir -p $(DESTDIR)$(BINDIR) $(DESTDIR)$(MANDIR)/man1 $(DESTDIR)$(SYSCONFDIR)/bash_completion.d
-	@install -v src/password-store.sh $(DESTDIR)$(BINDIR)/pass
-	@install -v man/pass.1 $(DESTDIR)$(MANDIR)/man1/pass.1
-	@install -v bash-completion/pass-bash-completion.sh $(DESTDIR)$(SYSCONFDIR)/bash_completion.d/password-store
+	@install -m 0755 -v src/password-store.sh $(DESTDIR)$(BINDIR)/pass
+	@install -m 0644 -v man/pass.1 $(DESTDIR)$(MANDIR)/man1/pass.1
+	@install -m 0644 -v bash-completion/pass-bash-completion.sh $(DESTDIR)$(SYSCONFDIR)/bash_completion.d/password-store
 
 uninstall:
 	@rm -vf $(DESTDIR)$(BINDIR)/pass $(DESTDIR)$(MANDIR)/man1/pass.1 $(DESTDIR)$(SYSCONFDIR)/bash_completion.d/password-store