Update AWS version to 1.11.5

[kden]

It looks like the 1.11.0 and up AWS versions broke compatibility with this version, at least for users who are using the most up to date version of AWS libraries in the same project. I've documented the error that I saw here:

http://stackoverflow.com/questions/37618971/com-amazonaws-transform-jsonerrorunmarshaller-method-initljava-lang-classv