make s3 chosen if no config option specified
rename *wrapper  to FilestoreManager
remove ToS3 from filestore commands
rename configuration option for filestore.
add details of interface to FilestoreWrapper.coffee for reference.
remove api comments
rename settings.filestoreManager to settings.persistorManager
revert settings.persistorManager
change the method for assuming s3
Merge pull request #10 from cwoac/rename_to_persistor

Finish abstracting persistor manager