Adding autoprefixer-core

This is actually more useful than autoprefixer since this is the
programmatic interface

autoprefixer-core/autoprefixer-core-tests.ts

@@ -0,0 +1,9 @@
+/// <reference path="autoprefixer-core.d.ts" />
+import autoprefixer = require("autoprefixer-core");
+
+var css: string;
+
+var prefixed = autoprefixer.process(css).css;
+
+var processor = autoprefixer({ browsers: ['> 1%', 'IE 7'], cascade: false });
+console.log(processor.info());

autoprefixer-core/autoprefixer-core.d.ts

@@ -0,0 +1,44 @@
+// Type definitions for Autoprefixer Core 5.1.11
+// Project: https://github.com/postcss/autoprefixer-core
+// Definitions by: Asana <https://asana.com>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+declare module "autoprefixer-core" {
+    interface Config {
+        browsers?: string[];
+        cascade?: boolean;
+        remove?: boolean;
+    }
+
+    interface Options {
+        from?: string;
+        to?: string;
+        safe?: boolean;
+        map?: {
+            inline?: boolean;
+            prev?: string | Object;
+        }
+    }
+
+    interface Result {
+        css: string;
+        map: string;
+        opts: Options;
+    }
+
+    interface Processor {
+        postcss: any;
+        info(): string;
+        process(css: string, opts?: Options): Result;
+    }
+
+    interface Exports {
+        (config: Config): Processor;
+        postcss: any;
+        info(): string;
+        process(css: string, opts?: Options): Result;
+    }
+
+    var exports: Exports;
+    export = exports;
+}