Remove @NotEmpty validation for boolean property

You can't have @NotEmpty on a property of primitive type (it's not
possible for it to be null), so validation checks fail and crash
without this change.
Merge pull request #2 from dsyer/feature/validation

Remove @NotEmpty validation for boolean property
Updated version
Updated version number
updated pcf version compatibility
manual merge b/c i messed up
The service broker API specifies that an HTTP 410 (Gone) is returned from unbind and deprovision requests when the entity does not exist.
Merge branch 'davidehringer-master' into v2.3
bumped version to 2.3.2 based on pull request.
Added ServiceInstance, the serviceId, and the planId to the deleteServiceInstanceBinding method.
Merge branch 'davidehringer-master' into v2.3
pass serviceId and planId to ServiceInstanceService per the api spec
bumped version
bumped spring boot version