docs(js): corrects function name to shim AMD modules

Fixes #7072
Merge pull request #7075 from PerJensen/docs_js_issue

docs(js): corrects function name to shim AMD modules
chore(travis): Stop downloading composer locally

Travis PHP 5.3+ environments come with composer pre-installed already
Merge pull request #7077 from ewinslow/travis-composer

chore(travis): Stop downloading composer locally
docs(all): fixes typos and improves readability
fix(views): respect icon_sizes config values when rendering icons

Remove hard-coded references to available icons sizes and use global icon_sizes config values and keys instead
Merge pull request #7088 from hypeJunction/icon-sizes

fix(views): respect icon_sizes config values when rendering icons
docs(cron): adds RST documentation about cron jobs

Converts wiki cron page to RST and references cron in Upgrading docs

Refs #6884
docs(all): improves formatting and comprehensibility of docs

Reworded some paragraphs to make more sense to new users. Applied formatting to some lists and paragraphs
Merge pull request #7087 from hypeJunction/docs

Fixes typos and adds cron RST docs
fix(embed): Manually load CSS/JS libs for embed when editing comments on the activity page.

Fixes #6422
Merge pull request #7107 from brettp/embed_activity_ajax

fix(embed): Manually load CSS/JS libs for embed when editing comments on...
fix(embed): Checking for lightbox and embed before loading JS libs when requested through AJAX.

Refs #7107.
fix(walled_garden): ACCESS_PUBLIC no longer available in group context

When walled garden is enabled ACCESS_PUBLIC is removed from the access
options, except in the group context. This fix also removes it for the
group context.
fix(groups): removes ACCESS_PUBLIC from visibility options if walled
garden is enabled

In a walled garden site nothing is allowed to be public, this also
applies to the visibility of groups
Merge pull request #7038 from jeabakker/group-visibility-walled-garden

fix(groups): removes ACCESS_PUBLIC from visibility options if walled garden is enabled
Merge pull request #7035 from jeabakker/groups-walled-garden

fix(walled_garden): ACCESS_PUBLIC no longer available in group context
Merge pull request #7109 from brettp/embed_activity_ajax2

fix(embed): Checking for lightbox and embed before loading JS libs when ...
feature(ckeditor): add "clear formatting" button

Adds a button that can be used to reset styles e.g. after copy-pasting content from somewhere else.

Fixes #7105
Merge pull request #7129 from juho-jaakkola/ckeditor_remove_formatting

feature(ckeditor): add "clear formatting" button