Add more accurate logging, make sync faster

Add information to logging:

• site url (need for multisite installations)
• error logging for wp_insert_post

Disable default sleep (was 1 second) between fetching items, to make sync faster.

Full Changelog: v2.0.6...v2.0.7

v2.0.6

Full Changelog: v2.0.5...v2.0.6

v2.0.5

Make property type field in item filtering form more dynamic (get values from item data instead of hard coded ones)

Full Changelog: v2.0.0...v2.0.5

v2.0.0

• Heavy recode: use Kivi REST-API instead of XML
• Use UI-formatted -data from API instead of raw data
• Display images using CDN instead of downloading as local media

v1.0.4

Added possibility to prefilter imported items.

v1.0.3

• Missing assets of slick carousel (Issue #3)
• More specific css selectors for admin css (Issue #2)
• Shortcode for listing based on assignment type (PR #1)

v1.0.2

Added a shortcode for listing based in item type.

v1.0.1

Fixes to scheduling.