Add AssumeRoleWithSAML support for AWS
Ensure that if the aws credentials requests requiring the signature fail
Fix link to documentation
Fix code style
Add simple test
[AWS|Storage] make s3 IO based uploads retryable again

requires that excon be updated to support retrying request_block based requests
[DigitalOcean] Helper methods for flavor,image,region,ips
Moved to Fog::Core
Fix style
Merge pull request #3301 from eLobato/do_server

[DigitalOcean] Helper methods for flavor,image,region,ips
Merge pull request #3294 from fcheung/rewindable_s3

[AWS|Storage] make s3 IO based uploads retryable again
Merge pull request #3278 from ColinHebert/assume_role_with_saml

Add support for "Assume role with saml" in AWS
Merge pull request #3302 from rackspace/fog-bin

Move Fog::Bin into fog-core
[AWS|Storage] allow signature version to be set to 2 (WIP)
recognize aws_signature_version option
Use old style date header for signature v2
Merge pull request #3304 from dennybaa/master

fixed backups in DigitalOcean
Merge pull request #3303 from fcheung/s3_v2_signature

[AWS|Storage] allow signature version to be set to 2 (WIP)
Removing Atmos
bump fog-core dep