Move LocalStore to new subpackage to prepare decomposition of nested
classes.
Extracting local attachment classes from LocalStore to reduce file size.
More nested classes extracted from LocalStore.
Extracted LocalFolder and LocalMessage definition from LocalStore
Extracting Database Setup Schema definition form LocalStore.
Some minor code cleanings and logging for LockableDatabase
Merge pull request #3 from frommeyerc/merge-upstream

Extract inner classes from LocalStore