Make xmodule_assets incremental, rather than removing the entire generated asset tree
Make xmodule_assets incremental, rather than removing the entire generated asset tree

caesar2164/edx-platform,Stanford-Online/edx-platform,caesar2164/edx-platform,Stanford-Online/edx-platform,jbassen/edx-platform,jbassen/edx-platform,jbassen/edx-platform,jbassen/edx-platform,Stanford-Online/edx-platform,jbassen/edx-platform,Stanford-Online/edx-platform,caesar2164/edx-platform,caesar2164/edx-platform