Show values for text and rich text custom attributes in modals

@reciprocitylaran this is work in progress, but it should display values for text and rich text custom attributes in modals. Sharing the half finished state because you might find it useful when debugging/working on save functionality.
Audit is using a tree view instead of an info view, so that won't work even
if you fix this issue. We have a separate story for tree views...

On Monday, December 1, 2014, reciprocitylaran <notifications@github.com>
wrote:

> In src/ggrc/assets/javascripts/apps/custom_attributes.js:
>
> >      content: "<content/>",
> >      events: {
> >      },
> >      helpers: {
> >        with_custom_attribute_definitions: function(options) {
> > -        var instance = this.instance,
> > +        var instance = this.instance || GGRC.page_instance(),
>
> There's a bug in this. When creating a new Audit from the Program page
> this.instance is undefined, so GGRC.page_instance() is used. However, this
> returns a program. So, the lines below return attribute definitions for the
> program. I'm going to see if I can figure out how to resolve this.
>
> —
> Reply to this email directly or view it on GitHub
> <https://github.com/reciprocity/ggrc-core/pull/2073/files#r21122051>.
>