Cleanup
Bump dependencies versions
Add engines field
Set _connected
Enable multi-server fallback
Fallback to config-example for tests
Wrap JSON.parse in try/catch
Add  field to server configuration for concurrent connections to the same host
Cleanup, fix .disconnect
Add JSDoc style comments
Support callback style
Add offline queue, update code comments
Add optional cancel support to offer_create.
Expose Base58 functionality in API.
Bump version to 0.7.15.
Merge branch 'develop'