Fixed logging (class name instead of instance)
Fixed mixin lookup in the model

Lookup now handles Occi::Core::Mixin instances as well as String
identifiers.
Updated fixtures for the dummy backend

* Added a few mixins to compute fixtures
* Added new resource_tpls
* Aligned all resource_tpls with other backends
Updated fixtures for the ONE backend

* Added new mem-heavy resource_tpls
* Updated existing resource_tpl values for cores and mem
* Updated resource_tpl schema name (prefixed with 'schema.')
Updated handling of descriptions and summaries

* Setting default descriptions for all resource types
* Skipping blank descriptions when parsing to OCCI
Fixed description handling for compute in ONE
Merge pull request #35 from arax/one_templates

A collection of various small updates and fixes