Usability improvement to kCurlHelper class

Imported From: http://groups.google.com/group/in-portal-dev/browse_thread/thread/ada866ee21ac6ead#

In-Portal has kCurlHelper class to automate process of retrieving data from
other API's or websites, like Google Data API or RSS feeds.

All works fine, when queried website has no errors. In case if website sends
500 HTTP response code (error) or there will be a connection timeout to that
site, then response from kCurlHelper::Send method will be the same: *empty
string*.

Such result is not sufficient for web sites, where *empty string *means
something special response. In such cases I usually check for last HTTP code
to be 200 OK and no connection error has occurred.

In attached patch there is new kCurlHelper::isGoodResponce method for doing
all that.

Task:

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