Add plugin with basic support for UIKit -> Android widget conversions

[angelolloqui]

Optional plugin that could transform some types:

UIView -> View
UITextField -> EditText
UIButton -> Button
UILabel -> Label
UITableView -> RecyclerView
UIScrollView -> ScrollView
UIImageView -> ImageView
...

Then, as part of the same or other plugin, we could also make use of Butterknife (http://jakewharton.github.io/butterknife/) to map @IBOutlet to @BindView(R.id.<variable_name>) and @IBAction to @OnClick(), which is not always the event we want but most of the times.

Resulting code will be far from funcional, but of a good starting point when converting UIKIt views to Android views.