LunarML v0.2.0

Changes since v0.1.0:

• More work on IO: PrimIO/ImperativeIO/TextIO.StreamIO/BinIO.StreamIO
• Enable dead code elimination for the initialization file
• Pipe operator in $(SML_LIB)/basis/pipe.mlb
• New documentation
• JavaScript: JavaScript.Lib.Map/Set/WeakMap/WeakSet
• Lua: Add Lua.method0/method1/method2/method3
• Uncurry optimization