Thread pool reverted, cached thread pool contains keepAlive timeout 60seconds and behaves better, Fixes android-async-http#382

Author: smarek

library/src/main/java/com/loopj/android/http/AsyncHttpClient.java

@@ -210,7 +210,7 @@ public AsyncHttpClient(SchemeRegistry schemeRegistry) {
 
         ThreadSafeClientConnManager cm = new ThreadSafeClientConnManager(httpParams, schemeRegistry);
 
-        threadPool = Executors.newFixedThreadPool(DEFAULT_MAX_CONNECTIONS);
+        threadPool = Executors.newCachedThreadPool();
         requestMap = new WeakHashMap<Context, List<WeakReference<Future<?>>>>();
         clientHeaderMap = new HashMap<String, String>();