Merge pull request #20 from Philhil/update_GLUON_RELEASE

date format ISO 8601/ DIN 5008 compliant

site.mk

@@ -45,7 +45,7 @@ GLUON_SITE_PACKAGES += \
 	kmod-igb
 endif
 
-DEFAULT_GLUON_RELEASE := 1.0+$(shell date '+%Y.%m.%d')-g.$(shell git -C $(GLUONDIR) log --pretty=format:'%h' -n 1)-s.$(shell git -C $(GLUONDIR)/site log --pretty=format:'%h' -n 1)
+DEFAULT_GLUON_RELEASE := 1.0+$(shell date '+%Y-%m-%d')-g.$(shell git -C $(GLUONDIR) log --pretty=format:'%h' -n 1)-s.$(shell git -C $(GLUONDIR)/site log --pretty=format:'%h' -n 1)
 
 GLUON_LANGS := de en