WordPress import error 

Hi, I was importing a blog directly from the db and I'm getting this error in jekyll-import version 0.2.0. This is not happening with version 0.1.0.

```sh
error: undefined local variable or method `continue' for JekyllImport::Util:Module. Use --trace to view backtrace
```
This error occurs with both commands:
```sh
$ jekyll import wordpress --dbname my-wp-db --user root --prefix wp_
```
and
```sh
$ ruby -rubygems -e 'require "jekyll-import"; JekyllImport::Importers::WordPress.run({"dbname" => "my-wp-db", "user" => "root", "password" => "", "prefix" => "wp_", "comments" => false })'
```

I've changed the `continue` with `next` and everything seems to be working just fine.