Allow accessing map directly for internal calls

This helps with debugging (you don't have to step through ramda's curry while debugging)

lib/index.js

@@ -186,9 +186,10 @@ flyd.endsOn = function(endS, s) {
  * var squaredNumbers = flyd.map(function(n) { return n*n; }, numbers);
  */
 // Library functions use self callback to accept (null, undefined) update triggers.
-flyd.map = curryN(2, function(f, s) {
+function map(f, s) {
   return combine(function(s, self) { self(f(s.val)); }, [s]);
-})
+}
+flyd.map = curryN(2, map)
 
 /**
  * Chain a stream
@@ -385,7 +386,7 @@ flyd.curryN = curryN
  * var numbers = flyd.stream(0);
  * var squaredNumbers = numbers.map(function(n) { return n*n; });
  */
-function boundMap(f) { return flyd.map(f, this); }
+function boundMap(f) { return map(f, this); }
 
 /**
  * Returns the result of applying function `fn` to this stream
@@ -427,7 +428,7 @@ function chain(f, s) {
     internalEnded(newS.end);
 
     // Update self on call -- newS is never handed out so deps don't matter
-    last = flyd.map(own, newS);
+    last = map(own, newS);
   }, [s]);
 
   flyd.endsOn(flatEnd.end, flatStream);