Added playback features and logic
Bug fixes and new features, see description

Additional features
! Change default theme to A
! 10th second for get current position button for positions
! audio volume to increase smoothly from 0 to 1
! audio volume to decrease smoothly from 1 to 0
! Add delayed countdown when playing start
! Center button groups on screen if they don't expand properly
! Make buttons and all larger and easier to click on
! Group positions list and delay dropdown in a nicer way
Positions area to be scrollable
Animate when position entry is added or removed
make app visible in recent apps dialog
playback to pause in app onpause and ondestroy events
responsive css for horisontal layout
responsive layout for tablets
Browse for files on device or enter URL

Issues found and resolved
! Stop playback when changing songs
! Fix song stop playing if editing a position entry
! bug, add file is added when return from config, clicked load dev json
! playing song should stop playing if new media successfully added
! update body if new media successfully added, currently keeps positions
! when selecting add file but then cancel, the selection does not return
to current song
! makes a blip when loading media
! makes a blip sometimes when using positioned play
! when selecting a song, stop button returns error (should not be
clickable or not do anything)
! changing songs second time without playing causes error message
!  ok to change songs once, but not second time
!  ok if any song has been played then this does never occur
!  plays right position for split of a second and slider shows right
also
!  then restarts from beginnig, setting slider to 0 and does not count
up
!  second time any position clicked shows undefined error message
!  once alert closed it starts playing as expected
!  pushing play now assigns controls to current media stream
! on first run any positioned run plays from 0, second time is all good
! find a way to determine if a song is loaded or not
! confirm sliding slider is working once debug disabled
! Popup auto closes instantly once opened
! When removing a set and file is defaulted to 0, it keeps removed media
path
Completed move to listview and added features

Additional features
! make app visible in recent apps dialog
! playback to pause in app onpause and ondestroy events
! Show duration of selected file using proper class
! Change dropdown menu to popup and lists
! Add key value for last played media file
! Move remove media file feature to media file listview

Issues found and resolved
! Clicking twice on a delayed play position before file has loaded
generates error
! Confirmation for deletions of media files misbehaving due to popup
jquery
! Issue dealing with initialising local file navigation from a popup
Added custom animations, responsive css and file browsing

Additional features
! Animate when position entry and media file is added and removed
! Responsive CSS for portrait mode and another for tablets
! Browse for files on device