add more std modules

std/basic.lamb

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+-- Standard basic library for the Lamb programming language
+-- Copyright (c) 2013 darkf
+-- Licensed under the terms of the zlib license, see LICENSE for details
+
+const(x) -> \_ -> x.
+compose(f, g) -> \x -> f(g(x)).

std/math.lamb

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+-- Standard math library for the Lamb programming language
+-- Copyright (c) 2013 darkf
+-- Licensed under the terms of the zlib license, see LICENSE for details
+
+pow(base, 0) -> 1.
+pow(base, exp) -> do
+	if exp < 0 then 1 / pow(base, neg(exp))
+    else base * pow(base, exp-1)
+end.

std/op.lamb

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+-- Standard operators library for the Lamb programming language
+-- Copyright (c) 2013 darkf
+-- Licensed under the terms of the zlib license, see LICENSE for details
+
+-- binary operators
+add(x,y) -> x+y.
+mul(x,y) -> x*y.
+div(x,y) -> x/y.
+
+cons(x,y) -> x::y.
+
+eq(x,y) -> x==y.
+neq(x,y) -> x != y.
+
+lt(x,y) -> x<y.
+gt(x,y) -> x>y.
+
+and(true,true) -> true.
+and(_,_) -> false.
+
+or(true, _) -> true.
+or(_, true) -> true.
+or(_, _) -> false.
+
+xor(true, false) -> true.
+xor(false, true) -> true.
+xor(_, _) -> false.
+
+-- unary operators
+neg(x) -> 0-x.