Merge pull request #430 from cgunning/bigip_exporter

Adding BIG-IP exporter

content/docs/instrumenting/exporters.md

@@ -41,6 +41,7 @@ vet all of them for best practices. Commonly, those exporters are
 hosted outside of the Prometheus GitHub organization.
 
    * [Apache exporter](https://github.com/neezgee/apache_exporter)
+   * [BIG-IP exporter](https://github.com/ExpressenAB/bigip_exporter)
    * [BIND exporter](https://github.com/digitalocean/bind_exporter)
    * [Ceph exporter](https://github.com/digitalocean/ceph_exporter)
    * [CouchDB exporter](https://github.com/gesellix/couchdb-exporter)