Merge pull request #311 from carlosleopoldo/master

Spanish translation
Made menu description in header a bit more descriptive. Fixes #307.
New feature: 'select' fields now support 'multiple: true'. Fixes #288
Minor tweak: escaping & as &amp; in record.twig.

@harm10 ;-)
Add "multiple select" example to kitchensink.
Remove some leftovers from multiple select functionality.
"Developer" and "Admin" users always have access to all of the contenttypes. Fixes #283.
Fix disabling of users..
New feature: Allow 'default_status' in contenttype. Fixes #284.
New feature: Set the canonical in the <head>, and also fix the link to content pages. Fixes #279.
Removed last remaining 'divider' stuff. fixes #303.
Updated readme with list of 3rd party extensions
Merge pull request #318 from pvankouteren/temp-extension-list-in-readme

Updated readme with list of 3rd party extensions
Fixed issue #280 by using the locale and eventually a fallback to define the HTML to be in line with the application locale.
Merge pull request #319 from pvankouteren/issue-280-language-settings-locale-in-header

HTML lang attribute fix
Prevent slugs from ending with a '-'.
Don't show titles/names twice in contentrow. Fixes #312.
Finetuning the new 'add dummy content' functionality. Closes #241
Minor CSS tweak.
make sure we're not trying to access bolt as "/index.php/bolt/", because all paths will be broken. Fixes #277.