buildroot.sh: Indentation
buildroot.sh: Indentation
Don't abort when the .img.xz image failes, but give a warning instead.

The build runs fine on Raspberry Pi, but `xz` needs more memory than Pi provides.
Also keep the generated .img file needed later.
buildroot.sh: Build .img.bz2 as well

OS X users don't have `xz` installed by default, but it comes with `bzip2`.

The previous commit also helps with this scenario.
Don't abort when the .img.xz image generation fails, but give a warning instead.

The build runs fine on Raspberry Pi, but `xz` needs more memory than Pi provides.
Also keep the generated .img file needed later.
buildroot.sh: Build .img.bz2 as well

OS X users don't have `xz` installed by default, but it comes with `bzip2`.

The previous commit also helps with this scenario.
Added documentation for writing the image to SD card on a Mac.
Changed '.bz2' to '.img.bz2' since it's more correct and in line with the 'xz' description.
Replaced implicit link with an explicit markdown link.
Merge branch 'v1.0.x'
Merge branch 'master' into v1.1.x