This changes and reorganizes all of our css structure. It starts
to consolidate some of the stylesheets, but the majority of work
has just been to reorganize the files that we have so they can more
easily be found and edited. Not to mention a structure than can
organize any new features and styles we put into canvas!

7/23
* added correct path for compiled course_settings
* took out repeated variable sheet in publish_gradebook

7/22
* fixed css path for conversations styles

7/21
* changes from master rebase
* took out context_modules.sass because it was old and unused

7/17
* brought back legacy sass files and changed to right paths
* taking out ComboBox to move to analytics plugin
* moved tinymce file to correct place, fixed js file paths to point
to it correctly
* brought tinymce sass file to stylesheets root to see if
jenkins passes
* rebased master, took out onneeded _environment.sass

fixes DES-83
* regression fixes from master rebase

fixes DES-83
* fixes compile error on jst/UserObservees.sass pulling in environment

fixes DES-83
* brings back in calendar.css so we can separate that deletion out
  on a separate occasion

fixes DES-83
* take out user_observees since it's a handlebars sheet

fixes DES-83
* stylesheets/pages/ now has compiler sheets
  and a /shared/ partials folder
* consolidation for assets_real.yml - we've knocked this down
  to each page having one sheet that is compiling
* moved anything in /public/stylesheets that wasn't
  in our /app/stylesheets/ into there for better organization
* we've purged a few files that weren't being used or have been
  updated elsewhere

fixes DES-83
* takes out unneeded _newheader file
* removes redundant @import base/environment in _g component files
* renames app_common to c-common
* moves static css from /public into assets/stylesheets and modifies assets_real.yml to reflect new paths

fixes DES-83
* added _ prefix to g_ components in /components so they won't compile to stylesheets

fixes DES-83
reworking the way that we're overriding bootstrap
* deleted bootstrap-parts directory
* moved bootstrap-parts scss to /base
* renamed _main.scss to _custom_bootstrap.scss
* renamed _overrides.scss to _bootstrap_overrides.scss
* deleted empty and unused popover.scss file

fixes DES-83
moved /mixins into /base since they were only being called into _environment.sass

fixes DES-83
consolidated /bootstrap into /vendor

fixes DES-83
consolidated utilities into components

fixes DES-83
initial folder structure added
* reorganized existing css files for better structure

fixes DES-83
got rid of unneeded dump file

Change-Id: Id6f1409d478087a6cf9ebaa19ffa3a10b50891ca
Reviewed-on: https://gerrit.instructure.com/37280
QA-Review: Adam Phillipps <adam@instructure.com>
Reviewed-by: Ryan Shaw <ryan@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
Product-Review: Colleen Palmer <colleen@instructure.com>