The installer creates proper "full paths" on Windows

See discussion on [Stackoverflow](http://stackoverflow.com/questions/3418865/cannot-make-project-lombok-work-on-eclipse-helios).
In short, the installer creates relative paths for lombok.jar in eclipse.ini. This doesn't work if you star eclipse with a different working path than the eclipse installation path. The solution is to start the installer with `-Dlombok.installer.fullpath`. The installer escapes backslash and colon on Windows, thereby creating wrong entries. The patch fixes this.