Tracking whether or not a student is indie or not ...

An indie student does not belong to any school sektion.
His console can potentially look different from that of a school student.
Enrollment will impact the flag.

But the biggest impact would be when we stop supporting schools altogether.
Then, we can get rid of this attribute alongwith Quiz, Exam, Worksheets etc.
Blessed will be that day!!
Do not show initial modal to new, indie students ...

No need to confuse them with talk of enrollment/sektion codes
Scaffolding for showing stab feedback in student console
Corrected 'Cant mass-assign protected attribute' error in student registration

The error was occuring while processing geo-coding data and setting
city, state etc. for the newly created Account
Removed Deprecation warnings coming from layout files ...

Warnings coming due to render file: xyz call. Replaced
with render partial: xyz calls.
attr_accessor :login required
Added a temporary utility method to clone stabs for debugging purposes
Do not show anything when hovering on the slider ..

Only key presses in the stab grading panel
Move to next stab once graded ...

... and notify the grader when the last stab has been graded
preview.images for loadJson can now be an array of hashes ...

Each hash is of the form
  h = { path: relative_path, id: some_marker }

We need the latter format for optimizing stabs preview for students
Added a methods - remarks - to get remarks on all scans for this stab
Now recording quality as part of grading stabs
Merge branch 'puzzle'