added cron class #8
cron initialization and settings
added default credentials to API calls
changed plugin text domain #10
added admin update interval setting #8
moved cron class initialization into entry php file
PHPDoc @link comment
PHPDoc of the cron class
removed duplicated LICENCE file
moved cron in admin side of plugin initialization
clear WordPress schedule hook on plugin desactivation
removed useless comments
add call of wp_next_scheduled()

Check existence of schedule by calling wp_next_scheduled() function
instead of looping in _get_cron_array()
Merge branch 'scheduling' of https://github.com/Spoon4/slideshare-posts-import into scheduling

Conflicts:
	public/class-slideshare-posts-import.php
	slideshare-posts-import.php
try to move every cron code in entry point
bulk renamed SlideShare -> Slideshare
removed commented code
removed API limitation on slideshows request
set right schedule on cron import
Merge branch 'master' into scheduling

Conflicts:
	admin/class-slideshare-posts-import-admin.php
	admin/includes/admin-ajax-hooks.php
	admin/includes/class-slideshare-importer.php
	includes/functions.php
	slideshare-posts-import.php