WebView Delegation

[joventuraz]

In case a user needs to access the webview for different uses such as:

NSString *html = [webView stringByEvaluatingJavaScriptFromString:
                      @"document.body.innerHTML"];

The commits appended add the delegation needed to expose the webview by bubbling it's own delegate methods through SVWebViewController.

[nudge]

See #67 for an improved implementation.