Add JS file to the repo

    Also update README and Package accordingly.

package.json

 {
-    "author": "Aral Balkan <aral@ind.ie>",
-    "contributors": [
-        {
-            "email": "ekaitz.zarraga@protonmail.com",
-            "name": "Ekaitz Zarraga"
-        }
-    ],
-    "description": "Set template rendering engine by Ind.ie",
-    "keywords": [
-        "set",
-        "unobtrusive",
-        "dry-template"
-    ],
-    "license": "MIT",
-    "main": "set.js",
-    "files": [
-        "set.js"
-    ],
-    "name": "indie-set-core",
-    "repository": {
-        "type": "git",
-        "url": "git@source.ind.ie:ekaitz-zarraga/indie-set-core.git"
-    },
-    "scripts": {
-        "prepublish": "coffee -c set.coffee",
-        "test": "echo \"Error: no test specified\" && exit 1"
-    },
-    "version": "1.0.0"
+  "author": "Aral Balkan <aral@ind.ie>",
+  "contributors": [
+    "Ekaitz Zarraga <ekaitz.zarraga@protonmail.com>"
+  ],
+  "description": "Set template rendering engine by Ind.ie",
+  "keywords": [
+    "set",
+    "unobtrusive",
+    "dry-template"
+  ],
+  "license": "MIT",
+  "main": "set.js",
+  "files": [
+    "set.js"
+  ],
+  "name": "indie-set-core",
+  "scripts": {
+    "prepublish": "coffee -c set.coffee",
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "version": "1.0.0",
+  "repository": {
+    "type": "git",
+    "url": "git@source.ind.ie:project/set-core.git"
+  },
+  "devDependencies": {
+    "coffee-script": "^1.10.0"
+  }
 }