Upped timout value for archivertest, as it never runs within time on my laptop... And sometimes failes on Jenkins.
Added proto folder to protobuf generation.

 Some IDEs sometimes has trouble reading and importing directly from generated-sources.
Added WriteReport as return by Slot.write.
 - This will enable SimpleArchiver to write metadata files.
 - Other Archiver plugins might also be able to utilize this in the future.
Added finals, organized imports and simplified a few statements.
Added MetadataHandler for use with replay.
Removed setters in WriteReport and added those values in the constructor.
Fixes. * Sorry for lack of comment, I lost track of it all...
Optimized metadata writing by adding caching of BufferedWriter objects.
Added close method which closes the cached writers in MetadataHandler.
Merge pull request #123 from acidmoose/master

Added logcat error message
Merge pull request #117 from acidmoose/replay

This has been pending for too long.  We just have to merge it and exercise the code.
MetadataHandler was missing a flush() after write.

Note: This has the potential to slow down the log server since it
introduces flushing for each metadata entry that gets written, however
I don't think we have any actual choice in the matter: we have to
flush.  If performance issues arise we might have to add cleverness to
this.