Removed redundant masgn specs.
Added Rubinius::Type.coerce_to_type_error.
Check return value of a, b, c = 1.
Check return value of a, (b, c) = 1, x.
More masgn specs.
Fixed spec description.
Removed CI tags for passing masgn specs.
More masgn specs.
Updated Gemfile.lock.
Updated gems_list.txt.