Initial work on deserialization.
Better deserialization.
Merge pull request #75 from thelukester92/master

Update for beta 7.
Added a central deserializer class.
Added deserializing functions for a few more components.
Fixed a tile system issue.
Added some polish to the deserialization scheme and included more in the physics body and sprite deserializers.
Fixed an issue with followers.
Merge pull request #74 from thelukester92/deserialization

Implement deserialization