Setting sanitize contenthandler configuration as a Map is load.

If a configuration in Aloha.settings.contenthandler.sanitize was defined, this was never load unless
was a text ('restricted', 'basic', 'relaxed'). If a map of object was defined, this setting was
never load (see http://aloha-editor.org/guides/plugin_contenthandler.html).
With this fix, the sanitize object is load.
Fix english misspelling in changelog entry.
Merge pull request #1131 from najor/hotfix-0.24.x-rt57862-sanitize-allows

The sanitize contenthandler configuration is now loaded, even if it is set as a map