Merge pull request #147 from adamarla/master

Aggregation of GradedResponse and some billing related tables introduced
List latest exams first
[Big]: Changed the way sektions are created ...

We now ask for the sektion name, its expected lifetime and whether or
not it should be auto-renewed.

Once this initial information is given, the system can take care of
the rest. For example, the system can create a new sektion once the old
one expires
Send mail to teacher when new sektion is created
Merge branch 'master' of heroku.com:drona
Merge branch 'master' of https://github.com/abhinavc/web-application
 Minor bug fix
 Minor edit
Updated schema.rb - removed rate_code and cost_code tables
Monthly audit of sektions

Temporarily renewing sektions every day. Will revert to multiples of 1 month soon
Reverting to creating sektions from start-of-month to end-of-month
Explicit access specification for Sektion::graduate() method

It continues to be public. But just want everyone to know that it is explicitly so
List just the .name of active sektions + other minor corrections
Show comments for all responses on a given scan
Minor edits to how sektions are listed
 minor styling changes
Defined more fine tuned queries for delayed::jobs
Commented out code related to tracking demo-quiz builds

Demos have been done away with
[Hack]: Upped ping interval ...

.. to ensure that sample is ready along with quiz preview
Changed :partial => to partial: