Support CommonPrefixes in S3 list operations

See the S3 API docs for more information about CommonPrefixes and how
they work:

http://docs.aws.amazon.com/AmazonS3/latest/API/SOAPListBucket.html
Fixed broken version of erlcloud_cloudtrail. Reverted back to using httpc instead of lhttpc since the later doesn't work.
Added platform and product_codes attributes to return from describe_images(...)
Merge pull request #101 from campanja/add-support-for-common-prefixes

Support CommonPrefixes in S3 list operations
Added product_code and type properties to be returned from describe_images
In the previous commit I managed to overwrite a correct change. Doing it again... Added product_code and type properties to be returned from describe_images.
Changed back to use lhttpc and fixed code to not pass to content-type header parameters
Removed debug message
Removed unnecessary http_headers_body(...) patterns
Merge pull request #100 from ptrakhtman/master

Fixed broken version of erlcloud_cloudtrail. Reverted back to using httpc instead of lhttpc,
Merge remote-tracking branch 'upstream/master'
Merge pull request #102 from j14159/master

Basic autoscaling support
Merge remote-tracking branch 'upstream/master'