Add shindo tests for snapshots request layer methods.
Minor update to inline help.
Add snapshot model and collection to bloack storage provider.
Add snapshot model/collection and corresponding tests.
Merge pull request #1 from SDK-CLI-Docs/feature/block_snapshots

Feature/block snapshots
Add user_agent string to the core fog connection with corresponding tests.
Add customised user_agent string for HP providers. Also, enable passing a custom user_agent string from calling clients. Add corresponding tests.
Merge pull request #2 from SDK-CLI-Docs/feature/31_user_agent

Feature/31 user agent
Add volume_attachments to server model.
Merge pull request #3 from SDK-CLI-Docs/feature/58_server_volumes

Add volume_attachments to server model.
Bump version to 0.0.16 and update changelog.
Merge pull request #4 from SDK-CLI-Docs/feature/59_release_0.0.16

Bump version to 0.0.16 and update changelog.
Removed 'server' attribute from server model, and fixed 'all' method.
Removed 'images' attribute from server model.
Merge pull request #5 from SDK-CLI-Docs/feature/14_update_models

Feature/14 update models
Fix version info. that is used by user-agent.
Merge commit '20977a6' into develop
Add support for pulling out virtualization type when parsing AWS
Describe Instances results.
Add object temp url generation capability with mock support.
Add object temp url functionality to file model layer.