Fix issue with nullable composites

Merge pull request #10 from barryosull/fix/nullable-composite-bug

Fix for the valueobjects issue

Introduced variable composite types

Merge pull request #9 from m1x0n/feature/abstract-type

Added AbstractTypeObject with possibility of its serizalization/deserizalization

UUID bug, allowed UUID that were too long

See title, simple fix.

4.6.0

Create README.md

Nullable composites

Merge pull request #6 from barryosull/feature/nullable_objects

Nullable composites.

Adding Carbon

Merge pull request #5 from barryosull/feature/carbon

Added Carbon to the valueobject libs

Easy extension

It is now easier to extend the valueobjects library to allow the use of other VO libs, such as
https://github.com/moneyphp/money

Money money money

Adding money lib