Report ignored list item nodes. Fixes #163. Fixes #189.

There was a problem that any and all markdown nodes not handled at least by the `processNestedSection()` or
`isUnexpectedNode()` were silently ignored. This is because of the behavior of the "list adapter" where advancing
to a next node causes ignoring the rest of list item's nodes. This commit changes the behavior in a way that
every node (of a list item section) is treaded as unexpected if not handled by the `processNestedSection()`.
Treat subsequent nested sections as unexpected. Fixes #188.

Unexpected blocks that are recognized by subsequent nested parser should but aren't
immediate children of the actual section should be treated as unexpected sections in the
context of the actual parser. Therefore they will be handled as unexpected block by the actual
parser without giving back control to parents. Therefore the parser can recover from encountering
an alien block and continue to parse in the actual context.
Issue #109

Fixes issue #109 where nested parentheses within the parameter signature additional traits caused a failure to correctly recognise the signature as valid due to not matching the ParameterAbbrevDefinitionRegex.
I have removed the regex in favour of manually parsing the parameter signature so as to make the code clearer and more maintainable than what the regex would have had to become in order to match nested brackets within the additional traits as well as possible additional brackets in the signature description.

Note: This was commit was orginally missed out from the shared/refactor-integration, pressumably by a mistake

Conflicts:
	src/ParameterDefinitonParser.h
Issue #107

Fixes #107. Amended regex PARAMETER_IDENTIFIER to allow % encoded characters and added tests for valid, invalid and incomplete % encoding.

Note: This was commit was orginally missed out from the shared/refactor-integration, pressumably by a mistake

Conflicts:
	src/ParameterDefinitonParser.h
Some indentation & style fixes
Merge pull request #194 from apiaryio/zdne/regression-fixes

Additional Regression Fixes