Added link to the channel logs

> Wouldn't it seem that a #jclouds link could seem a link to join the channel?

I agree...but the same could be said of the mailing list links below. Perhaps update the mailing list links to match something like:
```
<a href="mailto:jclouds-user-subscribe@apache.org">Subscribe</a> to the jclouds-user mailing list (<a href="http://www.mail-archive.com/user@jclouds.apache.org/">archive</a>)```
```