added list of active students based upon sqlrating data.
Merge branch 'master' of https://github.com/n2diving/fistfive
student show view (will limit to instructors only) displays a line graph charting progress of a specific students ratings.
moved css, svg, and style elements into partial
Merge pull request #52 from n2diving/student_show

Student show
Working login/signup, preserved student show changes on controller