Merge pull request #37 from fengyapeng/master

Update TokenHolder.java

weixin4j-base/src/main/java/com/foxinmy/weixin4j/token/TokenHolder.java

@@ -74,6 +74,16 @@ public class TokenHolder {
 		tokenStorager.caching(cacheKey, token);
 		return token;
 	}
+	
+	/**
+	 * 手动移除token
+	 * @return 被移除的token
+	 * @throws WeixinException
+	 */
+	public Token evictToken() throws WeixinException {
+		String cacheKey = tokenCreator.getCacheKey();
+		return tokenStorager.evict(cacheKey);
+	}
 
 	public TokenStorager getTokenStorager() {
 		return tokenStorager;