* added listener for timedMetadata event.
* added callback in RCTVideo for the timed metadata
* exposing onTimedMetadata to JS
* added forgotten method declaration
* returning array of string values
* added metadata type to the array
* added onMetadata method
* overridden onMetadata method on exoplayer2
* added format of return value from onMetadata
* added function reference in README file
* Fix require(...) file resource on Android production
* Update example (use require for ./broadchurch.mp4)
* Fix MainApplication.java of example
* Add default source type