Revert "xulrunner: update from 31.0 to 32.0"

This reverts commit 109547b902500549c5b39abfceb7e0dbc5022a74.

Breaks on 32bit linux: http://hydra.nixos.org/eval/1154529#tabs-still-fail
arduino-core: bump version from 1.0.2 to 1.0.6

- replace fetchurl with fetchgit because googlecode is unmaintained
- remove unnecessary phases
- change license and maintainers
- tested with a few sketches and inotool

- change description according to "Contributors Guide"

change fetchgit to fetchFromgitHub

Closes #4449