commit most entity curd
commit entity
Merge remote-tracking branch 'origin/zhangjc' into release
merge zhangjc and fix some bugs
log fix
add orderdetail
Merge remote-tracking branch 'origin/zhangjc' into release
fix some bugs
Merge remote-tracking branch 'origin/release' into zhangjc
add code for deleting course
add code for course delete
add db operation in course download,adjuxt xml parsing