Merge pull request #5 from WhiteCoreSim/master

Pulling latest code from WhiteCore-Dev
File load & save error checking

* Scenemanager ( Load & save oar)
* AppearanceArchiver (load & save avatar archive)
* InventoryArchiver (load , save & save withoutassets iar file)
    - added some sanity checks for missing, invalid and existing
filenames.

* Rename WhiteCore/Modules/Region/AuroraArchiver.cs
.../WhiteCoreArchiver.cs
	(old format .abackup processing)
Minor database table name change

* DatabaseManager
    - Removed 'whitecore' from migration version table name.  >>
'migrator_version'
Merge pull request #2 from greythane/master

Pulling latest changes from Greythane