Merge pull request #16 from lucknessbuaa/master

add the user manage
Merge pull request #17 from lucknessbuaa/master

remove some files in migrations
Merge pull request #18 from lucknessbuaa/master

remove some files
add page and js for sign fetch
add fetch admin page
Merge remote branch 'origin/master'
modify some details
Merge remote branch 'upstream/master'