Snow, snow, snow

• add opam file for convenient development
• update following Io_page.t interface

The "it's still really cold" release

but at least we have

• an implementation of the new error_message function, to allow error message printing

Winter solstice release

To celebrate the winter solstice we release v0.9 of Xentropyd which

• watches for domains arriving and leaving on a Xen host
• connects to them over a console
• offers them entropy