This adds a command line flag called `--infer-private` which is a
string (defaults to `^_`) which is used as a regexp for inferring
if a name is private or not.
For example:
```js
/** C */
class C {
/** I'm public */
m() {}
/** I'm private */
_p() {}
}
```
Fixes#436
Note that the AST now carries the name “mdast”, meaning
utilities (such as mdast-util-inject) keep their name.
This name-change includes the `mdast` formatter, which also changed
to `remark`.
Additionally:
* Update relating packages.
* Fix a bug where `text` nodes without value were
[generated](6b905aefb1/lib/output/markdown_ast.js (L144)).
* Compare strings as lowercase, to permit for v4+ compatibility
* Fix bad reference to loc.name
* Update README badge and fixture
* Remove brfs dependency
* Remove traverse
* Remove browser transform support
