Add TypeScript declarations

Author: scott

index.d.ts

@@ -0,0 +1,9 @@
+export as namespace stable;
+export = stable;
+
+type Comparator<T> = ((a : T, b : T)=>boolean) | ((a: T, b : T)=>number);
+
+declare function stable<T>(array : T[], comparator? : Comparator<T>) : T[];
+declare namespace stable {
+    export function inplace<T>(array: T[], comparator? : Comparator<T>) : T[];
+}

package.json

@@ -8,6 +8,7 @@
         "url": "https://github.com/Two-Screen/stable.git"
     },
     "main": "./stable.js",
+    "types": "./index.d.ts",
     "devDependencies": {
         "tape": "2",
         "uglify-js": "2"