Updated gitignore for hidden files and build directory
Added simple HttpClient class
Added GPL v3 comments
Added dependecy on TinyXML2 and ICU
Fix warning in HttpClient
Fix FindICU cmake file for finding addition ICU libraries.
Added HttpResource class for representing resources.
Added HttpResponseParser class for parsing http responses and producing
HttpResource objects.
Added skeletons for RSS XML processing.
Added string utils functions.