[fix][Liu Lin] - change index.html and add.html to erb for fix functional test
[#008][Liu Lin] - add nowarp css to show product discription in table
[#009][Liu Lin] - valid productStock in the add product page
[#009][Liu Lin] - valid productStock in edit product page
[#009][Liu Lin] - refactor count.js
[#009][Liu Lin] - check stock in the back-end
[merge][SanCoder] - Merge branch 'master' into sancoder