Always specify default sun https handler

Issue when using this library in Weblogic is that Weblogic it provides its own https handler implementation. Thus line 915 (of the original source) fails when it attempts to cast the Weblogic URLConnection (SOAPHttpsURLConnection) to the default sun (HttpsURLConnection).

Solution here was to create the _baseUrl specifying the default https handler.

For more info about URL.openConnection() returning alternate implementations, view the javadoc: http://docs.oracle.com/javase/7/docs/api/java/net/URL.html