Changes

[Fix] Fix an issue with serializing collections of enum constants.
 (commit: 3d4460a)

Ensure deserialization of collections of enum constants works.
 (commit: ea33395)

[0.12.1] Bump version, update changelog.
 (commit: 8ad8bc0)

[Bug #51] Add test reproducing the issue.
 (commit: 07206c0)

[Bug #51] Fix the issue of attempting to add JSON-LD context to a collection node.
 (commit: 66553da)

[0.12.2] Bump version, update changelog.
 (commit: 4ba4fca)

[Enhancement #54] Add acceptance tests for the feature.
 (commit: 600678e)

[Enhancement #54] Implement serialization of individuals as string with extended term definition in context.
 (commit: 26b2b80)

[Enhancement #54] Minor code cleanup, add some tests.
 (commit: 56ee07d)

[Ref] Simplify creation of JSON nodes.

Remove most of the checks for attribute name - it will be handled by the JSON node implementation itself so that it is done just in one place.
 (commit: d38ddd3)

[Ref] Simplify JsonNodeFactory, remove unused methods.
 (commit: 76982fb)

[Enhancement #54] Ensure extended term definition is correctly created for collection-valued object property attributes.
 (commit: ebf773a)

[Fix] Fix serialization of types with context when term is mapped in ancestor context.
 (commit: 0bc4f3c)

[0.12.3] Bump version, update changelog.
 (commit: 1428dc1)

[Doc] Update readme with info on serialization of individuals as strings.
 (commit: 101b6b0)