Merge branch 'release/0.3.0' into develop
Added toArray() function
Bumped version number, wrote entry in HISTORY.md, generated distributables.
Merge branch 'release/0.3.1'
Merge branch 'release/0.3.1' into develop
feat(model): Update go via PATCH, not PUT

Allows us to regulate which fields are updated, i.e. not necessarily all.
feat(model): Patch only with updated fields

In the model constructor, save the data to `_original`, so it can be diffed at a
later stage. Then, in `transformItemRequest`, return only the diff if
`_original` is set and if the object is not "new".

BREAKING CHANGES: Must call `_setOriginal()` in constructor in order to get the
diffing qualities.
Merge branch 'feature/patch' into develop
chore(release): release 0.4.0-beta
Merge branch 'release/0.4.0-beta'