Changes

[Upd, Feature #10] Add a configuration parameter for datetime serialization.

Update to JOPA API 0.18.1 which introduces some utility modules for date/time handling.
 (commit: b929ff4)

[Feature #10] Implement serialization of date/time as ISO string using ValueSerializer.
 (commit: 22ce7f4)

[Feature #10] Implement serialization of datetime values as the number of millis since epoch.
 (commit: 3c81513)

[Feature #10] Support globally configuring datetime format.
 (commit: cac09b0)

[Feature #10] Javadoc correction.
 (commit: 0fbc714)

[Feature #10] Incorporate new temporal serializers as built-in value serializers.
 (commit: 5cf1b93)

Align type coercion with JOPA's XSD datatype handling.
 (commit: 6facb44)

Rely more on JOPA datatype transformation. Simplify LangString handling.
 (commit: 8b809d9)

Minor deserialization cleanup.
 (commit: fedbe5f)

[Feature #10] Implement transformation between offset-based temporals and other representations (zoned, local, instant, date).
 (commit: e3ac3f8)

[Feature #28] Add interface and management for custom deserializers.
 (commit: 9544e89)

[Feature #28] Pass custom deserializers to the deserialization process.
 (commit: 1fc94ab)

[Feature #28] Use custom deserializer when it matches root target type.

Add mechanism to retrieve property target type.
 (commit: b57c666)

[Feature #28] Use custom deserializer when deserializing singular property value.

Simplify DeserializationContext.
 (commit: 34c9341)

[Feature #28] Use custom deserializer when deserializing plural property value.
 (commit: e166790)

[Feature #10] Implement and use custom deserializers for datetime values.
 (commit: 07e9f78)

[Feature #10] Implement and use custom deserializers for time values.
 (commit: 7bcdc47)

[Feature #10] Implement and use custom deserializers for date values.

Simplify literal value presence validation.
 (commit: 4e8d90e)

[Feature #10] Implement and use custom deserializers for Instant value.

Add integration test ensuring serialization and deserialization are compatible.
 (commit: 626ee56)

[Feature #10] Implement and use custom (de)serializers for TemporalAmount values.

Add integration test ensuring serialization and deserialization are compatible.
 (commit: 8a98e3c)

[Feature #10] Unify exception handling in datetime deserializers.
 (commit: d0195a7)

[Doc] Minor Javadoc updates.
 (commit: ab1bedd)

[Feature #28] Handle null returned from custom deserializers.
 (commit: c94ba17)

[Upd] Update dependencies.
 (commit: 3fc5c7c)

[Upd] Update to JOPA 0.18.5, fix Java 8 compilation issue.
 (commit: d472045)

[0.9.0] Bump version, update readme with info on new datetime-related parameters.
 (commit: f94eb24)

[Fix] Fix site name in pom.xml.
 (commit: 2727d5a)