started CS/JS backend

+class Multiset
+    constructor: (content...) ->
+        @content = {}
+        for item in content
+            if @content[item]?
+                @content[item]++
+            else
+                @content[item] = 1
+    eq: (other) ->
+        for item, count of other.content
+            if @content[item]?
+                if @content[item] != count
+                    return false
+            else
+                return false
+        return true            
+
+a = new Multiset(1, 2, 2, 3, 3, 3)
+b = new Multiset(2, 3, 2, 3, 1, 3)
+c = new Multiset(1, 2, 2, 3)
+
+console.log(new Multiset([1,2]))
+console.log(a.eq(b))
+console.log(a.eq(c))

+for CS in libs/js/*.cs
+do
+  coffe -c -m -o $(basename $CS .cs).js $CS
+done