Create a Procedure model and an example Page model

Page only contains a foreign key to a procedure for now.

Using this as a working branch and doing this in multiple pull requests.
Sounds good. I actually didn't realize this schema was based on the actual procedure syntax, so we can definitely clear some of this up.

> On Nov 11, 2014, at 12:51 PM, Joshua Kalpin <notifications@github.com> wrote:
> 
> In sana_builder/webapp/models.py:
> 
> >  
> > -# Create your models here.
> > +class Procedure(models.Model):
> > +    title = models.CharField(max_length=50)
> > +    author = models.CharField(max_length=50)
> I'd say the owner is the authenticated user that created it. In theory an organization could own the procedure and want to have their name on it. The spec also specifies no constraint on what the author text is and a user has some more constraints.
> 
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