Bug 1104013 - Add reftest task for b2g emulator
Merge pull request #39 from gregarndt/b2g_emulator_ics_opt_reftest

Bug 1104013 - Add reftest task for b2g emulator
Merge pull request #38 from walac/bugz/1098406

Bug 1098406: Fix gaia repository path.
Bug 1102085: Use "mach environment" to extract the object directory.

If "topobjdir" is None, use default object directory.