Files paths option.
Fixing README.
Option for selecting JSON format (currently only original and Howler.js).
Options for specifying silence length between sounds and minimum sound duration (to fix an iOS issue with REALLY small sounds).
Fixing code style.
Extra file types.
Changed minimum sound duration handling.
Merge pull request #10 from bassarisse/master


- Options to specify path for the files URL's on the generated JSON
- Basic Howler.js JSON format
- Silence gap duration selection
- Option for specifying minimum sound duration
- Some extra file types