Cloudbridge

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* Reworked test framework to rely on tox's test generation features. This
allows for individual test cases to be run on a per provider basis.
* Added more OpenStack swift config options (OS_AUTH_TOKEN and OS_STORAGE_URL)
* Added supports for accessing EC2 containers with restricted permissions.
* Removed exists() method from object store interface. Use get()==None check
instead.
* New method (img.min_disk) for getting size of machine image.
* Test improvements (flake8 during build, more tests).
* Misc bug fixes and improvements.
* Changed library to beta state
* General documentation updates (testing, release process)

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* Reworked the instance launch method to require subnet vs. network. This
removed the option of adding network interface to a launch config object.
* Added object store methods: upload from file path, list objects with a
prefix, check if an object exists, (AWS only) get an accessible URL for an
object (thanks VJalili).
* Modified `get_ec2_credentials()` method to `get_or_create_ec2_credentials()`
* Added an option to read provider config values from a file
(`~/.cloudbridge` or `/etc/cloudbridge`).
* Replaced py35 with py36 for running tests.
* Added logging configuration for the library.
* General documentation updates.

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* For AWS, always launch instances into private networking (i.e., VPC).
* Support for using OpenStack Keystone v3.
* Add functionality to manipulate routers and routes.
* Add FloatingIP resource type and integrate with Network service.
* Numerous documentation updates.
* For an OpenStack provider, add method to get the ec2 credentials for a user.


0.1.0 - Jan 30, 2016.
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* Initial release of CloudBridge.
* Support for Bucket, Instance, Instance type, Key pair, Machine image.
Region, Security group, Snapshot, Volume, Network and Subnet services.
* Support for paging results, block device mapping and launching into VPCs.
* Support for AWS and OpenStack clouds.
* Basic usage docs and complete API docs.
* 95% test coverage.
* Support for AWS mock test provider (via
`moto <https://github.com/spulec/moto>`_).