Demonstrates usage of blobstore file system api in scala

Formatted

Changed link to documentation
Updated scala version
String interpolation for output
Main extends App trait

Using scala-arm for managing context

Link to scala-arm in documentation

Calling 'acquireAndGet' instead 'acquireFor' managed context.
Changed output format to remove usage of string interpolation escape syntax.

Removed leading space in library dependencies configuration.
Removed superfluous comment.

Format, and modifications to documentation.

Removed superfluous comment.

Format, and modifications to documentation.