added method for getting signed url for s3 object

ref TheWeatherCompany/grid-api#374
update getSignedObjectUrl to use base context for keyPair values on bucket

ref TheWeatherCompany/grid-api#374
Merge pull request #47 from TheWeatherCompany/autoscaling-tags

Added ability to tag auto scaling groups and have tags propagated to cre...
Merge pull request #45 from TheWeatherCompany/signed-s3-object-url

added method for getting signed url for s3 object
Merge pull request #48 from TheWeatherCompany/autoscaling-tags

Added ability to update/remove tags on autoscaling groups.
Add support for AWS IAM Instance Profile

Closes #49
Closes #50
Ref TheWeatherCompany/grid-api#405
fix to virtual machine pulling the service provider role from AWS response

Closes #50
Ref TheWeatherCompany/grid-api#405
Add providerIdRole and detailedMonitoring to create launch configs

Closes #54
Ref TheWeatherCompany/grid-api/#412
Fix AWS InstanceMonitoring Param

Ref #54
Ref TheWeatherCompany/grid-api#412
Merge pull request #75 from TheWeatherCompany/support-iam-instance-profile

Support iam instance profile