Merge pull request #109 from jamlen/master

AllowedTypes for s3file. Implements #107
Adding options documentation for s3file fields
Updating the read me to reflect (and point to) the new documentation
Moving relationships higher, based on feedback that they're easy to miss
Adding cross-references to service config documentation in the database docs
Removing the "only a few lines of code" claim, see #88
Updating the usage documentation to refer to the getting started guide.
Added host option to specify the ip address to listen on.
Merge pull request #113 from Sgitario/master

Added host option to specify the ip address to listen on.
Adding documentation for #113