New branch for file structure change(#129) bug-fix for transcription(#84)

New branch for #129 is created.
(This branch needs to be tested to know update is working well)
(Commits from 'fbd1a37' are related to this issue #129) 
#129
- File structure and Recordings' metadata are changed
- This change will be automatically done by UpdateUtils using google account
- If the device has no google account, input dialog is triggered
- Recording's class model is changed to include 'versionName', 'ownerID'
- Recording's metadata now records 'versionName', 'ownerID'

#84
- Application-closing bugs while playing transcription player are fixe