Bug 967976 - Stop setting CCACHE_BASEDIR. r=catlee
Bug 967030 - allow mozharness_python to be overridden. r=catlee
Bug 961314 - Pass through tooltool_url_list to mozharness, r=aki

--HG--
extra : rebase_source : 87277c21720262d308847427de132db74dda46b6
bug 920153 - bump default mozharness test timeout to 1800. r=catlee
Bug 968545: remove nanojit support r=bhearsum
Bug 969542: Add periodic build support by platform r=rail