feat(parse): add method to parse files

[qfox]

Fixes #33

[qfox]

Seems like we need to get better name for it. Parse/stringify are not the best ones to do that.

/cc @blond @Yeti-or

[blond]

Need add tests should normalize decl for each BEMDECL version.

I think need use sinon.

[qfox]

Tests for normalize are out of scope of this PR.

sinon ok. For what purpose?

[blond]

Tests for normalize are out of scope of this PR. For what purpose?

Need check that normalize was called with the right options.

[qfox]

parse calls normalize and normalize-harmony internally with just one argument: decl: object[].

[blond]

parse calls normalize and normalize-harmony internally with just one argument: decl: object[].

Then check that calls necessary method with decl.

[qfox]

It is overkill, actually.

[qfox]

🆙

[blond]

👍