Amazon aws-java-sdk
Hadoop has an incompatible dependency on aws-java-sdk with the version in use here.
Therefore we are using Proguard to map the package names in aws-java-sdk in use
here to avoid runtime errros.
ProguardPre will create a mapping file of the aws-java-sdk and Mappings.preshim
will then filter and rename the mappings file before the final Proguard task runs the
mappings over the library.
Final mapping's { com.amazonaws -> com.ambiata.com.amazonaws }