Minor dep updates
Minor dep updates

WARNING: locked RSpec to v2.99 for compatibility reasons
Fixes EGI-FCTF/rOCCI-server#23, default format

Forcing default request format '*/*' to 'text/plain', as described
in the OCCI specification GFD.185 section 3.6.6.
Fixes EGI-FCTF/rOCCI-server#20, added CORS support

Added support for Cross-Origin Resource Sharing (CORS):
* Support for Access-Control-* and Origin headers
* Support for routing HTTP OPTIONS to a dummy controller
* Basic spec coverage
* Basic configuration options (enabling, setting origins)
* Disabled by default (possible security risk)

See `etc/*.yml` for details.
Updated core dependencies

Esp. rOCCI-core with important bug fixes:
* parsing attributes from headers
* parsing links from headers
* rendering inline attributes
Fixes EGI-FCTF/rOCCI-server#28, added mixin

Added the ipnetwork mixin to all parsed ONE vnets.
Fixes EGI-FCTF/rOCCI-server#29, ONE vnet type

Updated vnet parsing for ONE backend, RANGED and FIXED networks
are now correctly idenitifed as dynamic or static respectively.
Fixes EGI-FCTF/rOCCI-server#27, vnet attrs

When (re)adding new mix-ins to existing resource instances, corr.
attribute values are automatically re-set to `nil`. This has to be
handled manually.
Minor fix for storage description

Aligning behavior with virtual networks where summary has a default
used when filling in the description.
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
Minor version bump to 1.0.5