Added display of notifications to the application

notifications disappear after several seconds
Now using Paperclip to add Audio files

- Audio files can be added per quote
- If an audio file is present, it is played and looped upon visiting the home page
permiting audio files in the parameters of quotes
removed test folder
Merge branch 'feature/Audio' into develop
Changed colour to less opaque when displaying quotes
Now also supporting PNG/JPG backgrounds for quotes
Merge branch 'feature/background' into develop