Remove ResourceMethodSectionType. Fix separation of section types concerns.

ResourceMethodSectionType is remnant of the past and not needed under the current parser architecture. Similarly a `SectionProcessor` should never use another SectionsProcessor's regexes, they should be considered **private** to the respective processor. Instead expose a method that wraps the need for a processor's private refex. This way we will achieve separation of concerns.
Don't nest complete actions under resource. Fixes #185, fixes #187
Bump version
Better dangling asset handling. Fixes #186

Model dangling assets weren’t handled at all on the resource level.
Request dangling assets weren’t handled at all on the action level.
Use more descriptive warning message
Add short option for integration tests
Revisit handling of unexpected nodes. Fixes #190

BodySectionType & SchemaSectionType should have never been a nested
sections of action in the first place.
Merge pull request #193 from apiaryio/zdne/regression-fixes

Some regression issues fixes