Fix all but 1 lint warnings

 - Bring target sdk and build tools to current
   version

Author: rjbrock

AndroidAsync/lint.xml

@@ -1,3 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <lint>
-</lint>
+    <!-- Adding assertions into the codebase is intentional, so we can
+         ignore this error -->
+    <issue id="Assert" severity="ignore" />
+</lint>

AndroidAsync/src/com/koushikdutta/async/AsyncSSLSocketWrapper.java

@@ -1,5 +1,6 @@
 package com.koushikdutta.async;
 
+import android.annotation.SuppressLint;
 import android.os.Build;
 
 import com.koushikdutta.async.callback.CompletedCallback;
@@ -70,6 +71,8 @@ public java.security.cert.X509Certificate[] getAcceptedIssuers() {
                         return new X509Certificate[0];
                     }
 
+                    // this TrustManager only applies a fix, the actual certificate chaine verification is done elsewhere
+                    @SuppressLint("TrustAllX509TrustManager")
                     public void checkClientTrusted(java.security.cert.X509Certificate[] certs, String authType) {
                     }