Changing version to 1.0.15
Use fragments to support "new item" button in action bar
Fixed spelling of "occurred"
Fixed exception after lending an item again
Use dialog fragments to replace deprecated API usage
Use singleton for database adapter since list fragments now share the same activity context
Fix creation of example data
Example data is no longer needed
Merge branch 'fragments' into develop

Introducing fragments in order to support action bar icons
Excluding support library from ProGuard, disabling obfuscation
Ignore ProGuard logs
Updated changelog for 1.0.15
Merge branch 'develop'