bump version, readme fix

Author: Stephan Wentz

README.md

@@ -1,6 +1,6 @@
 Blocking Component [![Build Status](https://travis-ci.org/brainbits/blocking.png?branch=master)](https://travis-ci.org/brainbits/blocking)
 ==================
-The Locking Component provides methods to manager content based blocking.
+The Blocking Component provides methods to manager content based blocking.
 
     <?php
 
@@ -45,4 +45,4 @@ Blocking Validators
 -------------------
 Blocking validators test wether or not an existing block is still valid.
 
-A validator that checks a block via last modification time is provided.
+A validator that checks a block via last modification time is provided.

composer.json

@@ -1,7 +1,7 @@
 {
     "name": "brainbits/blocking",
     "description": "Object blocking",
-    "keywords": [],
+    "keywords": ["block", "blocking", "async"],
     "homepage": "http://brainbits.net",
     "license": "MIT",
     "authors": [
@@ -12,7 +12,7 @@
     ],
     "require": {
         "php": ">=5.3.0",
-        "symfony/http-foundation": ">=2.1"
+        "symfony/http-foundation": "2.3.*"
     },
     "require-dev": {
         "mikey179/vfsStream": "1.1.*"