Synnefo

Initial doc skeleton for the Plankton API

Minor fixes in docs/plankton.rst

Update quick install guide

Update archipelago documentation

Add synnefo overview image in documentation

Fix astakos documentation images

Add Pithos+ docs.

Integrate Pithos+ and Astakos documentation

Move and rearrange documentation concerning Pithos+ and Astakos.
Most content from the Pithos+ and Astakos repositories have been
integrated inside Synnefo's generic documentation.

Images have not yet been transfered. This is a WIP.

Major documentation refactoring

Merge documentation of different components and services
all together. Target to a generic, unified, robust
documentation tree.

This is WIP

Minor documentation fixes

rename snf-docs/ to docs/