remove load and fetchPage
remove nextPage and previousPage
rename to get(Next/Previous)PageNumber
use Content::asPage() instead of if/else
Merge branch 'editing' into editing-refactor

Conflicts:
src/scripts/models/contents/collection.coffee
fix asPage calls
Merge branch 'editing-as-page' into editing-refactor
fetch the page if it has not loaded yet
fix some asPage code
save to the correct page when Aloha change fires
make variable names more descriptive
clicking Back/Next buttons saves the right HTML
Merge branch 'editing' into editing-refactor

Conflicts:
	src/scripts/helpers/backbone/views/editable.coffee
	src/scripts/models/content.coffee
	src/scripts/models/contents/collection.coffee
	src/scripts/modules/media/header/header.coffee

src/scripts/modules/media/tabs/contents/popovers/add/modals/add-page.cof
fee
remove unnecessary fat arrows
Merge pull request #465 from Connexions/editing-refactor

Fix content saving to wrong Page and trim down content.coffee