Bug Fixes

• ,doc/fennel.doc: Don't mutate :fnl/arglist directly when showing callable form
• (set (. tgt k1 ...) v) now works on known globals and $, $1 ... $9 in hashfns
• Macro quote expansion no longer breaks when sym, list or sequence is shadowed
• Bring fennel.traceback behavior closer to Lua's traceback by not modifying non-string and non-nil values.
• Avoid losing precision when compiling large numbers on LuaJIT.
• Add syntax for representing infinity and NaN values.