Merge pull request #2326 from eileenmcnaughton/CRM-14069

CRM-14069 initial price set support for event.create
Obviously after a few months no input is forthcoming - merging this

diff --cc CRM/Event/BAO/Event.php
Simple merge

diff --cc CRM/Price/BAO/PriceSet.php
Simple merge

diff --cc api/v3/Event.php
Simple merge

diff --cc tests/phpunit/api/v3/EventTest.php
Simple merge