chore(ckeditor): upgraded CKEditor to version 4.3.2

Fixes #6500
chore(ckeditor): adapted plugin to work with CKEditor 4

Theme changed to moono, so removed specific BootstrapCK-Skin CSS
CKEDITOR.basePath wasn't working for plugins, so defined CKEDITOR_BASEPATH
Fix applied in #5689 is no more required
Wordcount own code replaced by wordcount plugin
Set allowedContent to true to do not filter tags (htmlawed already does it)
Configured new AutoGrow plugin
chore(ckeditor): more semantic strings in CKEditor interface

Refs 9a17024dc40af139c9a4911c32ba8e2703c032f0 and
4dd8301ab9d7d45913d51db9ba4a9868698bfd12
chore(vendors): deleting/deprecating old javascript libraries

Deleted:
    calendarpopup Not even used, replaced by datepicker.
    jquery.easing Already provided by jquery ui.

Deprecated:
    jquery.autocomplete deprecated in 1.9 by jquery ui.

Fixes #6478
chore(simplecache): rationalize use of elgg_register_simplecache_view()

Since elgg_get_simplecache_url() already calls it, it has no sense call it twice.
Merge pull request #6516 from sembrestels/simplecache_view

chore(simplecache): rationalize use of elgg_register_simplecache_view()
Merge pull request #6512 from sembrestels/rm-vendors

chore(vendors): deleting/deprecating old javascript libraries
Merge pull request #6511 from sembrestels/ckeditor4

Ckeditor4 upgrade
chore(travis): Allowing lines up to 160 chars in commit msgs.
Merge pull request #6525 from brettp/longer_lines

chore(travis): Allowing lines up to 160 chars in commit msgs.
fix(core): MenuBuilder sortByName should use strnatcmp

Just as MenuBuilder sortByText, the sortByName function should use
strnatcmp instead of strcmp

fixes #5569
Merge pull request #6502 from jdalsem/MenuBuilder-strnatcmp

fix(core): MenuBuilder sortByName should use strnatcmp
fix(css): prevent stretching images in IE8
Merge pull request #6526 from PerJensen/master

fix(css): prevent stretching images in IE8
fix(pages): memory leaks in large page trees

Uses ElggBatch to avoid memory leaks in large page trees, fixes $container type check

Fixes #6477
Merge pull request #6480 from hypeJunction/pages-fixes

fix(pages): use ElggBatch to avoid memory leaks