Cuttlefish 2.2.0

Changes

• Files can be read from Erlang applications packaged as .ez archives. This is useful for applications coming with their own configuration schema.

  The drawback is that errors due to failed I/O reads are uninformative: functions will return {error, undefined} instead of {error, posix()}. The reason is that the underlying function we now use to read files, erl_prim_loader:get_file/1, only returns error when something is wrong.