Minor stylistic changes
Do the following as part of deployment

1. start / stop / restart delayed_job as needed
2. create link to minthril within current_path/public.
   The various delayed_jobs will do their thing within minthril/ via the soft-link
Ignore public/minthriil. It has only generated files
Brought back UID to Quiz ..

The UID will store the relative path of the quiz within minthril/

This same concept - of UID - will also be used in worksheets
Initial changes to load preview images within minthril/
Quiz UID is stored separately ...

None of that encryption / decryption crap. The UID is derieved
from the SHA1SUM of the underlying TeX file
Renamed AnswerSheet -> Worksheet
A separate module with Minthril specific tasks
Re-named a folder created for worksheets

Three separate compilations done for a worksheet
	1. w/ solution
	2. a full version with space after every question
	3. an abridged version w/ just the questions
Initial rationalization of delayed jobs

With the right makefile and minthril/ structure, just one task
- CompileTex - can do all the compilations we need
Trimmed GradedResponse table for online offering

Connect response to worksheet - not testpaper ( redundant concept )
Also, gid rid of concept of marks given by the teacher
Annotated
Minor stylistic change
[Big one]: Got rid of Testpaper model

Testpaper as a concept makes no sense in the pure online offering.
Hence, getting rid of it and re-making connections within the Rails code