Add option to ignore location in json format

Currently, when we generate the JSON docs, It includes the location. The location includes the filename (absolute path with USERNAME).

Here is sample code from the JSON docs of `documentation.js` itself which includes the autor's (tmcw) name.
```JSON
"context": {
"loc": {
"start": {
"line": 22,
"column": 0
},
"end": {
"line": 28,
"column": 1
}
},
"file": "/Users/tmcw/src/mapbox-gl-js/js/ui/popup.js",
"code": "....",
"path": "js/ui/popup.js",
"github": "https://github.com/mapbox/mapbox-gl-js/blob/f23285cc5fc760921f455f601d113a52d7401a05/js/ui/popup.js#L22-L28"
}
```
Genrally user check in the generated docs to github or somewhere else. IMO opinion it's not good idea to check real user names.

## Proposal

* Have an option ( eg. `--no-location`) to exclude the location from the docs.

# Additional Info
* `documentation.js` version - 5.5.0
* Mode of uses - `cli`