Fix ESH Bug 450236
https://bugs.eclipse.org/bugs/show_bug.cgi?id=450236
Signed-off-by: Benedikt Niehues <b.niehues@external.telekom.de>

Signed-off-by: Benedikt Niehues <b.niehues@external.telekom.de>
ThingHelper#createAndBindItems: items and links will be reused, if they exist already

Signed-off-by: Andre Fuechsel <a.fuechsel@telekom.de>
added author tag and removed one unused imports

Signed-off-by: Andre Fuechsel <a.fuechsel@telekom.de>
Merge pull request #115 from qivicon/reuse-items-and-links

Graceful creation of items and links in ThingHelper
Merge branch 'Bug450236' of https://github.com/qivicon/smarthome into qivicon-Bug450236

Signed-off-by: Kai Kreuzer <kai@openhab.org>