[vsphere] allow to create a vm with multiple disks.

unitNumber has to be unique.
add IamInstanceProfile abilitie
fix existing spot specs
support parsing the iamInstanceProfile
Merge pull request #1426 from Amicus/topper/spot_iam_role_support

add IamInstanceProfile abilities to spot instances
Merge pull request #1428 from danny-g/master

Fog::Storage::AWS::Real
remove docs and related, they now live at fog/fog.github.com
update copyright notice year
rescue/retry when loading gems (possibly without rubygems)
closes #901
[xenserver] added create_sr request (create Storage Repository)
[xenserver] added destroy_sr request (destroy Storage Repository)
[xenserver] added unplug_pbd request
[xenserver] added new requests to compute service

- unplug_pbd
- destroy_sr
- create_sr
[xenserver] added unplug method to PBD model
[xenserver] missing Pool model attribute, new methods

- Added missing suspend_image_sr attribute
- added default_sr getter/setter
- added suspend_image_sr getter/setter
- added generic set_attribute method
[xenserver] added new methods to StorageRepository model

- destroy/save operations
- generic set_attribute method
[xenserver|docs] Added new example that covers a Citrix KB ctx116324 article

Translated http://support.citrix.com/article/ctx116324 to fog/xenserver
[docs::aws::storage] added [] to make it pretty
[docs::aws::storage] yard doc syntax fix
[docs::aws::storage] reformatted copy_object