Add Router::clearCache function.

Closes #15.

src/Router.php

@@ -105,6 +105,18 @@ public function cache($filename, Closure $callback, $cacheMinutes = 1440)
         return $cacheKey;
     }
 
+    /**
+     * Clear the cached data for the given routes file.
+     *
+     * @param string $filename
+     */
+    public function clearCache($filename)
+    {
+        $cacher = $this->container['cache'];
+
+        $cacher->forget($this->getCacheKey($filename));
+    }
+
     /**
      * Get the key under which the routes cache for the given file should be stored.
      *

tests/IntegrationTest.php

@@ -382,4 +382,22 @@ public function testCanUseResource()
         });
         $this->assertEquals(8, $router->getRoutes()->count(), 'Routes must be obtained from cache');
     }
+
+    public function testCanClearCache()
+    {
+        // Create a controller class.
+        $controllerName = str_shuffle('abcdefghijklmnopqrstuvwxyz');
+        eval('class ' . $controllerName . ' extends Illuminate\Routing\Controller { }');
+
+        // First, define a route.
+        $router = $this->getRouter();
+        $key = $router->cache(__FILE__, function () use ($router, $controllerName) {
+            $router->get('/{foo}/{bar}', $controllerName . '@getIndex')->where('foo', '\w+')->where('bar', '\d+');
+        });
+        $this->assertTrue($this->app->cache->has($key), 'Routes must be in cache');
+
+        // Next, clear it.
+        $router->clearCache(__FILE__);
+        $this->assertFalse($this->app->cache->has($key), 'Routes must no longer be cached');
+    }
 }