Add more info to package.json

Package name and repository URLs probably need to change though.
Upgrade temp
Remove temp files on exit
Allow specifying wiki config as an object

Also, only read in ~/.wikirc when it may be needed (i.e. the first time
a string is passed to setWiki()).
Remove { rejectUnauthorized : false } from default request settings

It can still be specified as follows in ~/.wikirc:

[mywiki.request]
rejectUnauthorized = false

Or in a config object:

wiki.setWiki({
    // ...
    request : {
        rejectUnauthorized : false
    }
});
Change package name to node-mediawiki