Merge pull request AsyncHttpClient#42 from pkulak/patch-1

Deal with bogus character sets in the content type, ie: "charset=".

Author: jfarcand

src/main/java/com/ning/http/util/AsyncHttpProviderUtils.java

@@ -432,7 +432,7 @@ public static String parseCharset(String contentType) {
         for (String part : contentType.split(";")) {
             if (part.trim().startsWith("charset=")) {
                 String[] val = part.split("=");
-                if (val[1] != null) {
+                if (val[1].length > 1) {
                     return val[1].trim();
                 }
             }