Incorrect link in Organization snippet on dataset page

![screenshot from 2014-08-13 12 16 09](https://cloud.githubusercontent.com/assets/200230/3904593/7c95ee52-22db-11e4-8d7c-444948e824cb.png)

Looks like if you define a variable inside a with statement on Jinja2 this variable is not available inside a block:

```html
{% with truncate=truncate or 0, url=h.url_for(controller='organization', action='read', id=organization.name) %}
<!-- url defined here -->
  {% block info %}
  <div class="module module-narrow module-shallow context-info">
    {% if has_context_title %}
      <h2 class="module-heading"><i class="icon-building"></i> {{ _('Organization') }}</h2>
    {% endif %}
    <section class="module-content">
      {% block inner %}
      {% block image %}
        <div class="image">
          <a href="{{ url }}">      <!-- url not defined here -->
...

```
This means an empty href, which effectively links to the same dataset page.