Changes to make graph tabs look like tabs

Not completed yet, saving changes to pull from master
Resolving git problems
Removed border changes

very small change
assistance scores updated for nodes that are complete and are in the student model
Merge branch 'master' into dillanbutler
new parameters added, table structure updated one value to be tested for a student in class eno. value coming unexpectedly high
new values added and tested.
form added to take care of the time scenarios
json validator added which checks whether the parent node exists, few jsons updated accordingly
Random seed, conditional and nan feedback
problem statement and description related text changes
Bug# 2428
Merge branch 'master' into sachin
No description, make name description
Fixes for bug fix for 2428. Still has a small bug.
Merge branch 'avaneesh' -- adding delete node button.
Fixed border issues with auto description
Final description changes
Merge branch 'master' into dillanbutler
Fixed bug 2559