Merge pull request #99 from jgrewe/tutorial

Tutorial

LGTM
Section: impl. __setitem__ for easy prop creation

This should all creation of properties with s['key'] = value
[test] section[key] = prop tests
Merge pull request #101 from gicmo/section_setitem

that looks damn good to me :-)
Section: expose properties as .props
[test] TestSection: modify to use .props
Section: simplify, i.e. dict like, value access

Provides the value of proprties for Section['prop'] instead
of the Property. Should make it easier to work with odML

Cf issue #102
[test] Section: tests for dict like value access
Merge pull request #103 from gicmo/section_value_access

Section: more dict like access for values
Section: Add nix.S for easy section creation
[test] Test easy section creation
Merge pull request #105 from gicmo/section_creation_helper

Dict-like section creation via helper
Section: dict like access for sections

We prefer properties over sections to not break any existing
code. Cf. issue #102
Section: return sections also in .items()

To be consistent with dict like access
Section: also check for subsection in __contains__

Again, to be consistent with dict like access
[Test] Section: test for dict like access
Section: return props+sections from from .__iter__
Section: Use data.section_type not S.section_type
Merge pull request #106 from gicmo/section_dict_section

Section dict access: expose sections from s['key']

LGTM, thanks alot
PyResult: wrapper for validation results

- wrapper for nix::valid::Result
- wrapper for nix::valid::Message