Update information in config.yml.dist as URLs have changed
Update index.php
Added default values for the $late parameters.
Added is_array(), because PHP was acting like a moron again.
PHP-serialization -> JSON encoding

Phasing out serialize() / unserialize() in favor of JSON-encoding;
JSON-encoding is actually *faster* than serialization, and it doesn't
come with the security issues that unserialize() introduces (remote code
execution through injecting serialized data).

To be tested.
Moved HTML tags from __ params into template

Parameters are plain text, template is considered pre-encoded HTML;
hence, using tags in the parameters does not work as desired.

Fixes #1064
Merge pull request #1055 from GawainLynch/hotfix/GoogleAnalytics

Update information in config.yml.dist as URLs have changed
Added .svg to allowed filetypes. Fixes #1067, hopefully.
Bumping version to 1.5.4 dev.
Updated CKeditor to version 4.3.3. Removed "MediaEmbed" plugin, added "Media (oEmbed)"