Merge branch 'release/v1.3.0' into develop
Add missing search fields - Closes #118

* Added the fl (field limit) field to the API via the ReturnFields
  property.
* Added the op (operation) field to the API via the DefaultOperation
  property.
* Added the presrt field to the API via the PreSort property.
* Updated release notes.
Update version, adjust bug fix number
Merge branch 'release/v1.3.1'