samples/simple-unix.rb: reduce server-initialization delay for client
lib/proxy.rb: override Proxy.raise to avoid `$stdout` stream pollution
MessagePasser.rb: Notifier#wait ret. immediately if previously signalled
MessagePasser.rb: moved Notifier class to its own file
Message.rb: indentation fix for class `InvokeMessage`
README.md: shortened document title
Message.rb: re-formatted some lines to reduce line length
Message.rb: made `is_copyable?(obj)` class method more readable
ObjectNode.rb: added support for using unified message IDs
Added support for method-attributes database, certain attributes

We now can specify an array of attribute-symbols for arbitrary methods
via Proxy::ObjectNode.set_method_attributes(klass, method, attrs).

Currently defined attributes are `:noreturn` (indicates that Proxy should
not wait for a return value) and `nocopy` (never copy/always proxy the
method's return value).
proxy-rmi.gemspec: added 'lib/proxy/Notifier.rb' to gem's files

Missed in commit @9f5d8ee.
proxy-rmi.gemspec: removed some old copied-over comments
proxy-rmi.gemspec: reduced version to 0.1.0 for now

You'll have to explicitly uninstall any previously-installed ProxyRMI
gems before installing ones build after this change.
proxy-rmi.gemspec: updates to gem summary and description
MessagePasser.rb: cleaned up handling of the separate I/O streams
Notifier.rb: minimize time lock is held in `wait()`
Object.rb: remove ref. to old class variable, move a statement in ctor
proxy.rb: some tweaks to print style for uncaught exceptions
Client.rb: remove block-on-msg-send for sev. methods added in @6a0baec
Client.rb: use `handle_message` on result of remote eval

This allows error-type messages to result in an error being raised.