fix IME input problem
Merge pull request #202 from shen6041/patch-1

fix IME input problem (CefSharp1)
More whitespace to da peoplez.
Converted some tabs to spaces.
Added a fix for #219, or so we hope. :) The thing is that we need to implement GetViewRect() and GetScreenRect() to force the popups to always be layouted inside the view; otherwise, we run into problems when the window is e.g. located close to the bottom screen border or similar.
Create CONTRIBUTING.md