Fix relative path to .gitignore and other minor changes.
Fix relative path to .gitignore and other minor changes.

R=kjellander@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/1624005

Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 6367fe885a3ab6704b5eb066dadf98713ccc5d88

sippet/webrtc,sippet/webrtc,sippet/webrtc,sippet/webrtc,sippet/webrtc,sippet/webrtc