imported pi logo svg from wikipedia
source: http://en.wikipedia.org/w/index.php?title=File:Raspberry_Pi_Logo.svg&oldid=564049265
new raspicheck logo with full asset according to the iconography guidelines
http://developer.android.com/design/style/iconography.html#launcher
replaced the Launcher-Icon
changed the web-icon
Merge pull request #53 from larsgrefer/feature/launcherIcon

Feature/launcher icon