Unused imports
Make backup location trait sealed and add a helper method to get type description
whitespace
Fix compile errors
Get rid of duplicated code and do custom stack trace parsing

By default all stack trace elements are concatenated using " " space. It's not really readable, in case if error slips to API response to end user. This custom string representation of stacktrace is using line delimiter for concatenation.
Add a custom exception handler of REST API controllers for 'StorageNotFoundException'
Merge pull request #10 from ifunsoftware/fix_compile_error_and_issue_9

Fix compile error and issue 9