Ploy-ansible

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* Update Ansible requirement to < 2.dev0. The upcoming 2.0.0 has way too many
internal changes to be supported.
[fschulze]

* Add hosts only once in Inventory.
[fschulze]

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* Added handling of ``groups`` option of instances to allow definition of
additional Ansible groups.
[fschulze]

* Get host variables on demand instead of at startup. If you have many hosts
with encrypted yml files, this speeds things up considerably in most cases.
[fschulze]

* Fixes for changes in ansible 1.9.
[fschulze]

* Added ``inventory`` command to list all known groups and their
associated hosts.
[fschulze]

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* Pass on the ``sudo`` setting if the ``roles`` option is used.
[fschulze]

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* Fix sudo support for ansible > 1.6.
[fschulze]

* Print warning when using an untested version of ansible.
[fschulze]

* If ansible isn't installed, then require >= 1.8 as that doesn't violate
the sandbox of buildout anymore.
[fschulze]

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* Test and fixes for changes in ansible 1.8.
[fschulze]

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* Limit Ansible to pre 1.8, as > 1.8 breaks stuff.
[fschulze]