[FEATURE] basic live ledger stream
[FEATURE] Add Travis CI config.
[DOC] Add a bit to the README.
[TASK] Update travis init_db command.
[FEATURE] Added basic models
[DOC] Add Travis build status image.

[DOC] Add Travis build status image.

[DOC] Update Travis name.
[TASK] Removed database timestamps
[FEATURE] Added ledger downloader. Added unique indexes
[TASK] Code cleanup
[FEATURE] Retrieves ledgers oldest first
[TASK] Code cleanup
[FEATURE] Determine needed ledgers in a smart manner
[TASK] Updated gitignore
[FEATURE] Updated database schema for the ledgers table
[FEATURE] Updated ledgers table schema
[FEATURE] Used setImmediate to fix max call stack
[FEATURE] Updated transaction database schema
[FEATURE] Database schema and object saving changes
[FEATURE] Improved logic and error handling
[FEATURE] Added rollback on ledger database errors