Add new 'nanoc' plugin

plugins/nanoc/nanoc.plugin.zsh

@@ -0,0 +1,9 @@
+alias n='nanoc'
+alias na='nanoc autocompile'
+alias nco='nanoc compile'
+alias nci='nanoc create_item'
+alias ncl='nanoc create_layout'
+alias ncs='nanoc create_site'
+alias nd='nanoc deploy'
+alias nv='nanoc view'
+alias nw='nanoc watch'