Split non-md spec reader

[Igmat]

This reader should be used as base for every reader (except .md obviously) in order to parse spec files and special comments (most probably something like: /// # Some md-like header) which will separate different tests in one spec. Part of comments also could be used as description messages in console for failed/passed tests. Also this reader could help with generating docs from specs.

[Igmat]

Seems like, better solution is additional reader that will produce split output that can be chained to other readers.