-------------------
* Test, enhance and document adding massagers via config.
[fschulze]
* Moved ec2 and fabric integration into separate plugins.
[fschulze]
* You can now have instances with the same name if the belong to different
masters, they will then get the name of the master as a prefix to their name.
[fschulze]
* Add possibility to overwrite the default config name.
[tomster]
* Improved ``proxycommand`` and documented it.
[fschulze]
* Make the AWS instance available in masters. This changes the ``get_masters``
plugin interface.
[fschulze]
* Use os.execvp instead of subprocess.call. This allows the use of ``assh`` in
the ``proxycommand`` option, which greatly simplifies it's use.
[fschulze]
* Added command plugin hooks.
[fschulze]
* The variable substitution for the ``proxycommand`` option now makes the other
instances available in a dict under ``instances``. And adds ``known_hosts``.
[fschulze]
* Load plugins via entry points instead of the ``plugin`` section in the config.
[fschulze]
* Allow fallback to password for ssh to plain instances.
[fschulze]
* Add option to ask for manual fingerprint validation for plain instances.
[fschulze]