Merge pull request AsyncHttpClient#193 from dadoonet/getwithbody

Following HTTP RFC, GET can contain a BODY

Author: jfarcand

api/src/main/java/com/ning/http/client/RequestBuilderBase.java

@@ -459,8 +459,8 @@ private void resetMultipartData() {
     }
 
     private void checkIfBodyAllowed() {
-        if ("GET".equals(request.method) || "HEAD".equals(request.method)) {
-            throw new IllegalArgumentException("Can NOT set Body on HTTP Request Method GET nor HEAD.");
+        if ("HEAD".equals(request.method)) {
+            throw new IllegalArgumentException("Can NOT set Body on HTTP Request Method HEAD.");
         }
     }