Make it possible to add @ApiObjectField annotation on getters and setters

[bjfr]

To be able to support Google AutoValue (https://github.com/google/auto/tree/master/value) it would be nice if the @ApiObjectField annotation cound be placed on getters and setters of the abstract object, as the fields themselves are not available to the restcontroller.

[gauravguptain]

+1

[fabiomaffioletti]

See #171

[zakdigital]

Very important feature also for me. I recommend to add an @ApiObjectProperty annotation instead of adding the method element type to @ApiObjectField.

[a-persson]

+1