convert all .sass files to .scss files

If you are git blame-ing a file, start from the parent
of this commit. this does nothing.

this is just the result of running:
`sass-convert app/stylesheets --recursive --from sass --to scss --trace`

closes: CNVS-18797

test plan:
* load canvas.
* click around to a couple pages
* the css should be the same as it was.

Change-Id: Id4b051bd7e3d57428d6c4b8f92330c7e0d3ab6bb
Reviewed-on: https://gerrit.instructure.com/49288
Tested-by: Jenkins
Reviewed-by: Chris Hart <chart@instructure.com>
Product-Review: Ryan Shaw <ryan@instructure.com>
QA-Review: Ryan Shaw <ryan@instructure.com>

Author: ryankshaw

app/coffeescripts/jquery/indicateLoading.coffee

@@ -2,7 +2,7 @@ define [
   'jquery'
 ], ($) ->
 
-  # possible values for position are 'center' and 'after', see g_util_misc.sass
+  # possible values for position are 'center' and 'after', see g_util_misc.scss
   # passign a position is optional and if ommited will use 'center'
   $.fn.indicateLoading = (position, deferred) ->
     unless deferred?

app/coffeescripts/util/mimeClass.coffee

@@ -9,7 +9,7 @@ define [
   # if there is a file format that is common enough, go ahead and add an entry to one of these:
   # If you need to make a new class, make sure to also make an svg for it in public/images/mimeClassIcons/
   # and a class name in app/stylesheets/components/_MimeClassIcons.scss
-  # (and app/stylesheets/components/deprecated/_fancy_links.sass if it is still being used)
+  # (and app/stylesheets/components/deprecated/_fancy_links.scss if it is still being used)
   mimeClasses =
     audio:
       displayName: I18n.t('Audio')