Add support for path namespaces.

Particularly useful if using a styleguide which uses a particular
namespace.

lib/Loader.php

@@ -138,7 +138,14 @@ public function get_loader() {
 		if ( $open_basedir ) {
 			$rootPath = null;
 		}
-		$fs = new \Twig_Loader_Filesystem($paths, $rootPath);
+		$fs = new \Twig_Loader_Filesystem(array(), $rootPath);
+		foreach ($paths as $namespace => $path) {
+			if (is_string($namespace)) {
+				$fs->addPath($path, $namespace);
+			} else {
+				$fs->addPath($path);
+			}
+		}
 		$fs = apply_filters('timber/loader/loader', $fs);
 		return $fs;
 	}

lib/LocationManager.php

@@ -109,10 +109,14 @@ protected static function get_locations_user() {
 			if ( is_string(Timber::$locations) ) {
 				Timber::$locations = array(Timber::$locations);
 			}
-			foreach ( Timber::$locations as $tloc ) {
+			foreach ( Timber::$locations as $namespace => $tloc ) {
 				$tloc = realpath($tloc);
 				if ( is_dir($tloc) ) {
-					$locs[] = $tloc;
+					if ( ! is_string( $namespace ) ) {
+						$locs[] = $tloc;
+					} else {
+						$locs[$namespace] = $tloc;
+					}
 				}
 			}
 		}
@@ -142,4 +146,4 @@ protected static function get_locations_caller( $caller = false ) {
 	}
 
 
-}
+}

tests/test-timber-loader.php

@@ -124,5 +124,10 @@ function testTwigLoadsFromLocation(){
 			$this->assertEquals('<img src="" />', trim($str));
 		}
 
+		function testTwigLoadsFromLocationWithNamespace(){
+			Timber::$locations = array( 'assets' => __DIR__.'/assets' );
+			$str = Timber::compile('@assets/thumb-test.twig');
+			$this->assertEquals('<img src="" />', trim($str));
+		}
 
 	}