Update README
removed invalid annotations
add progress statistic to training.
added puma deploy script
add a simple training stat page to track student's progress.
using submission.done? in training/stats
leader board ranking, same exp, first come first
fix initial exp_upadate_at value populate
Merge branch 'master' of github.com:Coursemology/coursemology.org into dev/raymoond
Merge pull request #16 from exklamationmark/mark/better_setup_guide

Update README
mission dependency and mission file submission option
fixed exp awarding bug
fix for stats page crash when a user with achievement is deleted
achievement locked icon preference
paging preferences for most tables
sidebar badge for No. of enrol requests
fix for annotation summary bug
enrol count zero problem
add comment permalink view for questions in trainings.
show mission files in submission gradings