upgrade datamodel

add colums for normalized title and section index
fix section index, override title setter for Song
use Crashlytics logger
moved header file inclusion
changed another log call with crashlytics'
updated Crashlytics SDK
reorganize project
initialize storyboard manually
added accessor for AppDelegate
add StartupViewController to handle migrations
added recommended compiler warnings
simplify update
renamed datamodels to conform to default
change current model version
rename 1st model version
making titles optional again
use manual migrations
code cleanup
reposition element in proj
move function