include CMB2 as a submodule
version bump
Merge branch 'release/1.5' into feature/cmb2

* release/1.5:
  version bump
include the cmb2 loader file
adds a check if stock is enabled. to be used as a show_on_cb callback
add a helper function to get the book review library options
use the helper function -- callback function can't pass parameters
function to check if awards are enabled
load cmb from the right directory
make sure we're getting the right files. use require_once instead of include_once
replace the old additional information metabox with cmb2-powered metabox
use cmb2 metabox instead of old metabox for additional information box
replace ratings box with taxonomy_select box from CMB2
Merge branch 'feature/cmb2' into develop