Multi request and polling support

Closes #11
Minor release 1.1.0
Accounts for malformed cached data and loads from s3 instead
Patch release 1.1.1
Minor formatting tweak for specs using receive_messages
Minor formatting tweak for specs using receive_messages
Using hash that set returns
Patch release 1.1.3
Version elasticache cache objects

Closes #12
Minor release 1.2.0
Use latest version of 1.7 not specific version
Adds version to headers and changes name of sequence number to better reflect what it is
Patch release 1.2.1
Add S3 strategy boilerplate