New optional parameter for named
mdname which can contain a module/name.md value.
If this is given, the text file is loaded from server
and converted from md to html.
Example:
<modal-info v-if="showModalHelp" v-on:close="showModalHelp=false"
mdname="abcd/edit.md" />
Refs: lerntools/abcd#29
New optional parameter for <modal-info> named
`mdname` which can contain a module/name.md value.
If this is given, the text file is loaded from server
and converted from md to html.
Example:
```js
<modal-info v-if="showModalHelp" v-on:close="showModalHelp=false"
mdname="abcd/edit.md" />
```
Refs: lerntools/abcd#29