PHPAPI-1 : Add additional custom field checks {nb}
Addition for throwing exception when trying to change value of field with User Editable flag disabled.
PHPAPI-1 : Add additional custom field checks {nb}
Add throwing exception when trying to update ticket custom field values and some of required fields are empty

Signed-off-by: Saloni Dhall <saloni.dhall@kayako.com>
Merge pull request #8 from kayako/Feature/PHPAPI-1

Feature/phpapi 1