DynamoDB: DeleteItem command and a number of smaller enhancements

- Operational DeleteItem command (needs testsuite)
- An experimental FromDynItem and ToDynItem interface, a-la aeson
- A few missing exports and some performance fixes
- More general awsIteratedSource/List implementation

One TODO item left is to rewrite the existing awsIteratedSource/List functions in terms of the more general versions created here. 
That’s all from automatic stylish-haskell passes, sorting/aligning the import list. I can’t stand untidy code, sorry :)


On Sep 14, 2014, at 2:11 PM, Aristid Breitkreuz <notifications@github.com> wrote:

> In Aws/Aws.hs:
> 
> >  import           Data.IORef
> >  import           Data.Monoid
> > -import qualified Data.Text            as T
> > -import qualified Data.Text.Encoding   as T
> > -import qualified Data.Text.IO         as T
> > -import qualified Network.HTTP.Conduit as HTTP
> > -import           System.IO            (stderr)
> > +import qualified Data.Text                    as T
> > +import qualified Data.Text.Encoding           as T
> > +import qualified Data.Text.IO                 as T
> > +import qualified Network.HTTP.Conduit         as HTTP
> > +import           System.IO                    (stderr)
> Please avoid unnecessary code line changes.
> 
> —
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>