Do not call thyself! Fixes #180
Bump version
Sections layout & proper Resource Group action checks

Origin of the `SectionLayout` – this enum, dynamically resolved by section signature parsing
represents the layout of section being parsed to the `SectionParser::parse()`.

So far following three layouts are supported:

1. DefaultSectionLayout

    A default layout for all sections:

    - Signature
    - Description
    - Specific formatted content
    - Nested sections

2. ExclusiveNestedSectionLayout

    Section signature indicates that the rest of the section consists
    Exclusively of the Nested section, processing of default layout's
    description and content is skipped

3. RedirectSectionLayout

    Section signature indicates that it should be processed by a different
    parser. Sections `processSignature()` calls this parser and returns its result.
    Therefore this section is parsed and there is no sections own description,
    conent, or nested sections to be parsed.

These layouts are just a beginning towards a better architecture in section signature processors. In a future
sections processor like blueprint can build upon this feature.

In addition this commit introduces clear distinction between types of action sections to provide meaningful warnings while
not causing #181.

Also blueprint processor now reports all unexpected sections.
Fix indentation mistakes in SectionParser::parseNestedSections
Merge pull request #182 from apiaryio/zdne/resoruce-group-regression

Resource group regression fixes