Baldur/route preview

adds routing preview screen
I see that but the blank line (175) also ends in a newline character hence the extra line. If you delete this extra line github will still not show a whitespace error in the diff. Its only if the closing brace does not have a newline character after it that there is an issue.

Ex.

https://github.com/mapzen/mapzen-android-demo/commit/c8a3760347e301e8b58bc407d6a8b2eef3655a23