Added the entities function the use a hash to create the zpool.
Added a protection against someone tying to push a "tree" into a "disks" attribute (which used to be possible)
Added a wait for pool to become online function, which is used when an entity is created.
Added a duplication detection function that will fail the run, if a configuration that asks a device to exists in two vdevs.
Added a function that collects all the disks used on the system for pools, and doesn't allow a device to be used if it already in use in another pool.
Thanks to Bar's help, the entities can be nested (like the log example), with a deep traversal function
Added entities type of "resource".
Added description of new functionality to README.md and better explained the already existing one.
Incremented version to 0.0.4

… noted to "halt gears".

Added "graceful" directive to toggle the "halt gears" behavior.
Corrected the wrong default assignment of an array, for the entities hash, if no entity was passed to the provider to be created for the pool.

Added documentation.