v0.8

Back from a long hiatus. This is also the first time I'm uploading a Windows (cygwin) release :)

• Add builtin (functions like the Plan 9 rc's equivalent)
• switch pattern matching (regex) now requires full match instead of partial
• Fix file descriptor behavior
• Speed up fd syntax parsing
• Add -f option for read
• Slight code refactor (not really a feature)
• Better async safety for job control messages