restore material.rb
Merge branch 'second_period' of https://github.com/lifang/lantan_BAM into second_period
Merge branch 'second_period' of https://github.com/lifang/lantan_BAM into second_period
Merge branch 'second_period' of https://github.com/lifang/lantan_BAM into second_period
ipad tishi
Merge branch 'second_period' of https://github.com/lifang/lantan_BAM into second_period