Merge pull request #7 from MongeziNombewu/features/groups

Added kzm_group post type
Added empty file for announcement custom post type
Created a new custom type named "kzm_announcement"
Merge remote-tracking branch 'mongeziupstream/features/groups' into features/announcements
1] Added metafield group_id and wrote a function to save value as an array in meta
2] Created archive page for announcement
3] Have added new case for "kzm_announcement" under is_archive condition in mxpress_index.php file
4] changed a link of "join group" page as there were no page created in my dev server.
Added single announcement file
Modified announcement post page to select all groups under selected term(s)
Merge pull request #14 from Eluminsse17/features/announcements

Features/announcements
Merge remote-tracking branch 'origin/features/announcements' into temp/announcements

Conflicts:
	archive-kzm_announcement.php
	kzm_announcement.php
	mxpress_index.php
	single-kzm_announcement.php
	single-kzm_group.php
Merge branch 'features/announcements' into temp/announcements
[functions_announcements] Added broadcast message prefix text for annoucnements sent within mxit client.
[single-kzm_group] add include_once to required files, incase they have already been included.
[template_send_announcement] replaced 'include' with 'include_once'.