Sjang92/advanced settings feedback

@jrbl  @njdup

There were no validations being done in Studio's course advanced settings tab. 
Now course instructors receive feed back as a list of settings changes that has formatting/value errors.

![screen shot 2014-07-16 at 4 13 13 pm](https://cloud.githubusercontent.com/assets/3598201/3606958/e8fe92b8-0d3e-11e4-8fe6-b861b0a8b3d4.png)

Ah, ok. Yeah, ```git add -a``` can be sort of dangerous. I prefer doing a
```git status``` and then a ```git add``` with a cut-and-paste of all the
files from the status that I visually identify as being the ones I meant to
change. I often spot changes I didn't intend this way, and can revert them
before preparing the commit.


On Mon, Jul 21, 2014 at 3:17 PM, sjang92 <notifications@github.com> wrote:

> In common/test/data/uploads/asset.html:
>
> > @@ -1,10 +0,0 @@
> > -<!DOCTYPE html>
>
> I think this was a mistake. I'll add it back!
>
> —
> Reply to this email directly or view it on GitHub
> <https://github.com/edx/edx-platform/pull/4454/files#r15200475>.
>