FMDatabaseController shared instance to send DB calls to dispatch queue
queueInDatabase to wrap db operations in dispatch call
expose class method controller in public interface
move fmdb imports to header, expose queueInDatabase to public interface
import database controller, refactor createTables to use db controller
databasePath property
refactor, comment, unblockify :eggplant:
Merge pull request #5 from Fetchnotes/unblock-ui

[not ready] Don't block UI