return the request object in call.

will allow for doing other things with the request like setting
timeouts and such.
Updated default API version because the specified version of AWS API did not support filters. Added a test for filters. Also a minor refactor that makes sure the options always come after the Action in the request body to make debugging easier.
Merge branch 'master' of git://github.com/derekpitt/aws-lib into test
v0.2.0
Handle single error responses from AWS.

The result object can either have `Error` or `Errors` depending on the
service or the number of errors generated.

Refs livelycode/aws-lib/issues#42
Add STS support for cw, ec2, elb, simpledb, and sqs.
Expose aws client to api user.
Merge pull request #75 from willwhite/client

Expose aws client to api user.
Merge pull request #73 from willwhite/single-errors

Handle single error responses from AWS.
Merge pull request #74 from willwhite/token

Add STS support for cw, ec2, elb, simpledb, and sqs.
bump version to 0.2.1