Add index for describe_images parameters that use them
Merge pull request #2384 from jbence/feature/AWS_support_indexed_params_describe_images

[aws|compute]: Add index for describe_images parameters that use them
Sometimes :Environments is not a key
[bluebox] remove :host from excon request
[vcloud_director] fix models vms_test so is pending on empty environment
[aws|sqs] remove host/port from request

see #2284
Merge pull request #2386 from blueboxgroup/bluebox

[bluebox] remove :host from excon request
Merge pull request #2385 from moneypenny/master

fix Terremark ecloud environments nil reference
Merge pull request #2383 from alphagov/vms_test_fix_empty_env

[vcloud_director] fix vms_tests to be pending when run on empty environment
[AWS] add modify_vpc_attribute
[AWS] add modify_vpc_attribute
[vcloud_director] tests become pending not failing on absense of testable resources
Merge pull request #2388 from estonfer/modify_vpc_attribute

[AWS] Modify vpc attribute
adding spot price to launch configurations
Add IAMInstanceProfile support to launch configs
Merge pull request #2389 from alphagov/vcloud_director_model_test_fixes

[vcloud_director] tests become pending on absence of testable resources
[rackspace] fixing broken tests caused by bad helper
Merge pull request #2393 from rackspace/test_fix7

[rackspace] fixing broken tests caused by bad helper
Improve support for VPC Security Groups in RDS

* Ensures create_db_instance passes VPC args onwards
* Bumps API version so that VPC results are returned in describe calls
Merge branch 'rds_vpc_security_groups'