Ignore IDEA project files
First version of a Dynamo Session Store

Modifications from Mongo project:
 - moved manager and valve to net.energyhub.session package and reformat
   to EnergyHub coding standards.
 - Use Dynamo instead of Mongo
 - Use table rotation instead of mongo delete queries.
 - Gzip serialized sessions to save space
 - Add ignoreUri and ignoreHeader configs to skip session replication
 - Trim pom.xml to reduce unused dependencies
Remove dangerous keys() method, replace with dummy implementation in loadSessions()
notes on todos
integrate Alternator dynamo db mock
Fix heading in readme
do write-read check to make sure table is up after creation

- added more tests for other stuff
bug in created table put/get, exception handling in put/gets

test rotation
Merge pull request #1 from kramimus/dynamo

some fixes and tests