Improve string format in template

It's possible to use string formats to configure clusters, dependencies,
and escalations. Rather than exposing the immediate properties only
let's expose the entire object.
Recursively apply escalations/dependencies

Some people might find it useful to apply an escalation policy inside a
base service template. A service foo_bar inherits from foo, which
inherits from base. Applying an escalation at the base level would also
configure an escalation for the foo, and foo_bar services.
Initial support for partial inheritance

The logic here is entirely wrong. Nagios allows you to specify multiple
inherits to template from:

    use base_service,service

This is useful to configure 'service_foo' that inherits a command, and
possibly some contact info (or any attributes that are unset in
base_service really) from 'service', but inherits everything else from
base_service.
Fix bugs

We incorrectly named a kwarg 'config' instead of 'prefix' in
naglib_generate. This prevented using any prefix other than 'fixtures'.

There was a local scope collision in the ReClassifier engine.

We are trying to define clusterchecks more than once.
Release naglib 0.0.2