Resolved parenthesized pointer convertion.

fixed issue [200](https://github.com/mtoader/google-go-lang-idea-plugin/issues/200)
Resolved anonymous pointer field metheds

And fixed NullPointerException issue in GoStructureViewElement.java.
Updated test go file for issue 200
Merge pull request #210 from coocood/master

Resolved parenthesized pointer conversion.