Bump version.

Multiple changes. - Remove the runtime dependency on rake-compiler. - Use #rb_str_new instead of #rb_str_new2, the hash character array isn't null terminated. - Add various safeguards for object instantiations. - Remove the 'threaded' options for messages, folding them into 'archived'. If archiving is enabled, so is threading. - Return nil for lookups from the list object instead of raising exceptions. - Open subject indexes with the proper encodings (thanks Michael Granger!) - Allow touching and unlinking files to operate on multiple paths at once, within a single safety() wrap.

Migrate hashing functions to C.

Everything is workin! - Add a corpus of test messages to the spec data, with the script that generated them. - Add native objects for Authors, Messages, and Threads. - Tests!