add more problem stat

--HG--
branch : algo
add more stat

--HG--
branch : algo
add more link in submissions and profile page

--HG--
branch : algo
add log

--HG--
branch : algo
add  last 20 submissions status

--HG--
branch : algo
fix utf8 for java

--HG--
branch : algo
extra : source : 282c9f3619fdbc928982a5862c96f5377952b5a0
add struggle report

--HG--
branch : algo
fix bug for "stuck" and add authorization

--HG--
branch : algo
fix hof when submissions is not graded
fix db/seed

--HG--
branch : algo
merge

--HG--
branch : algo
fix displaying bug

--HG--
branch : algo
extra : source : 879a2d291b9d30bdf6259706d434829c9920b639
fix pdf to use inline display of browsers

--HG--
branch : algo
extra : source : 2b46fb6bd55e32a90c39e9932dc1a2cf2517d128