Naqvis Webview Versions Save

Fixed bind method bug. Thanks to @Ragmaanir for finding and proposing the fix.

Thanks @konovod for his patch and instruction to use webview on Windows.

closes #19

• Updated webview to its latest version 0.10.0
• Added new methods to Webview class
• Bumped Shard version to 0.2.0

Breaking Change

Webview.window no longer works with data:text/html. Invoke Webview#html method to set the HTMLs. README examples are updated accordingly.

First Release