Adds Jackson's @JsonProperty handling on class attributes and a simple unit test

[hugop95]

116

• Ignores empty values (@JsonProperty)

• Does not check for potential duplicate fields, i.e:

public class SimpleUserDto {
    @JsonProperty("isActive")
    private boolean active;

    @JsonProperty("isActive")
    private int anotherIsActive;

    private String isActive;
}

which passes without error and generates an attribute of type string

[kbuntrock]

Merged. Thank you for your contribution. :)

[kbuntrock]

Resolve #116