Update API. Fixes #41
Adds chooseFrom to JS API. Fixes #15
API Errors no longer block callbacks. Fixes #36
Adds update_settings method. Fixed #35.
Make require() sync in JS api. Fixes #48.
Closing the choose_from by the X button calls the callback with nil. Fixes #39.
Call doFn in JS API asynchronously. Fixes #47.