Please add stub for Schema::hasColumn()

[tacone]

Hello, thank you for this package.

I'm using some lib that uses Schema::hasColumn($table, $field) but Jenssegers\Mongodb\Schema\Builder does not override it and I get the following stacktrace:

 in Builder.php line 102
at FatalErrorException->__construct() in HandleExceptions.php line 133
at HandleExceptions->fatalExceptionFromError() in HandleExceptions.php line 118
at HandleExceptions->handleShutdown() in HandleExceptions.php line 0
at Builder->getColumnListing() in Builder.php line 69
at Builder->hasColumn() in Field.php line 455

I suggest to just stub the method:

    public function hasColumn($table, $column)
    {
        return true;
    }

That worked very well in my case.

[jenssegers]

Can you do a PR? :)

[tacone]

Whoops. I forgot :)

Here it is: #580