Merge pull request #19 from IET-OU/master

Bug #18, Fix to safely get json-decoded properties [LACE]
Bug #21, add new URL field to evidence post-type [LACE]
Bug #21, Follow up - add new URL field to evidence post-type [LACE]

* PHP:  define( 'WP_EVIDENCE_HUB_URL_FIELD' true );
Bug #21, Follow up 2 - add new URL field to evidence post-type [LACE]
Bug #8, Fix Javascript - hide "Loading" message in hyp_bars JS
Bug #18/ #23, Break long lines in preparation for encoding fix [LACE]
Bug #18, Break long lines in preparation for fix [LACE]
Bug #18, Move/fix "json_get()" function [LACE]

* Also, Bug #23, "print_json_data()" PHP function/method
Bug #18, Further fixes - safely get json-decoded properties [LACE]
Bug #23, Fix encoding problem in SVG - hypotheses have &#8211; [LACE]

* Should be em-dash (long dash) - Javascript encode: \u2014
* http://evidence.laceproject.eu/?json=hub.get_sankey_data&country_slug=World
Bug #24, Tighten protected/public/const in shortcode PHP [LACE]

* Part 1.
Bug #24, Part 2 - tighten protected visibility in shortcode PHP [LACE]
Merge pull request #22 from IET-OU/iet-ou/CR21/url-field

iet-ou/CR21/url-field: Add new URL field to evidence post-type [LACE]
Bug #24, Fix for tighten protected visibility in shortcode PHP [LACE]