auto restore last attempt training

![screen shot 2014-09-07 at 22 55 35](https://cloud.githubusercontent.com/assets/4983239/4178625/2f710756-369f-11e4-837b-8bb14d17017b.png)

1. If a student haven't done a coding question, his code will be saved and auto restore next time.

2.provide a button if he wants to revert to the template code

3.UI is not beautiful.. need improve
Must need a way to differentiate different textareas, then index is
intended to do that.

On Wed, Sep 10, 2014 at 8:31 PM, Raymoond Tang <notifications@github.com>
wrote:

> In app/views/assessment/training_submissions/_do_coding.html.erb:
>
> >  <div class="path_cm_txtbox cos_code">
> >    <textarea name="ans" id="ans" render="code"
> > +            index="<%= index %>"
>
> Please remove all code related to this index thing, I merely mean don't
> put script in erb file.
>
> —
> Reply to this email directly or view it on GitHub
> <https://github.com/Coursemology/coursemology.org/pull/203/files#r17357618>
> .
>