Merge branch 'release/0.2' into develop
Upgrade version to 0.3.dev0.
Merge branch 'hotfix/0.2.1' into develop

Conflicts:
	lima/__init__.py
Include version 0.3 in changelog.
Merge branch 'hotfix/0.2.2' into develop

Conflicts:
	CHANGELOG.rst
	lima/__init__.py
docs: Fix link to tutorial.
README, doc-index: fix typo.
schema: Add docstrings for intended behaviour ...

... not yet implemented.
schema: new field definition features, fixes + tests

as documented in the docstrings of the last commit:

- schema class definition: support "only" argument in __lima_args__
- schema instantiation: support "include"

also, make sure field overriding works as documented (with class var
fields clashing with __lima_args__['include'], but none of those
clashing with fields from base classes
Merge branch 'feature/fields-include-only' into develop
Update CHANGELOG.
PEP8 fixes.
schema: Refactor some internals.

To better reflect the planned implementation of maintaining field order
SchemaMeta: Replace Schema namespace dict with OrderedDict

to later get the field order correct.
schema: Update helper functions to return OrderedDicts.

also: improve their docstrings a little.
schema: Implement ordered fields (plus tests).

Details are documented in docstrings.
Merge branch 'feature/ordered-fields' into develop
Document new field definition options.
schema: Fix typo in docstring.
docs: Add reminder: exclude/only mutually exclusive.