Move interaction code out of Server, into Run.

This is because the interaction feeds are per-run now, rather than a single
global feed per server.

The Feed and Reader classes are merged now that each run has a feed and the
actual reading of the feed is done via the Run object's connection to the remote
server due to security requirements.
Simplifications for per-run feeds.

No longer need to check that each interaction belongs to the correct run and
also don't need to worry about getting interactions in a particular timeslot.
Get different types of notifications for a Run.

Can now get requests, replies, new requests or all notifications.
Expose the run notification/interaction locations.

This is to help using a proxy to pass these communications through so that we
can conform with the Taverna Server security model.
Add Run#log to get run logs.

Can be streamed, etc like the calls to download zip files.
Merge branch 'rh/int' into next

* rh/int:
  Expose the run notification/interaction locations.
  Get different types of notifications for a Run.
  Simplifications for per-run feeds.
  Move interaction code out of Server, into Run.
Merge branch 'rh/logs' into next

* rh/logs:
  Add Run#log to get run logs.
Add connection timeout parameters.

Can now set timeouts for opening connections and reading from connections via
the parameter objects.
Updated ratom version.
Enable interaction reply publishing.

This is done directly from the notification object that the reply is for.
Read the interaction serial number from the notification.
Enable retrieval of an interaction's input data.
Minor documentation fixes.
Minor updates to the main Readme.
Update the email address in the gemspec.

Should point to mygrid support, not me personally!
Update change-log.