Update README.md

Fix typo.
Merge pull request #476 from ingilniero/master

Update README.md
Use only ID selector to speed up test
Merge pull request #477 from GeekOnCoffee/spec_fasterness

Use only ID selector to speed up test
Allow select2-rails v3.4 and up.
Modularizes user roles.

In order to include specific user roles in applications or engines, we need to separate the user roles into modules.
Adds dutch translation.
Fixes issue with essence validation for uniqueness.

Validating the uniqueness of an essence always leaded to a failing validation because the way of finding a duplicate was wrong: We did not consider that we also find the essence that is currently validated.
Adds tests for validating the presence of essence ingredient.
Fixes issue where error message of essence was not set.

The error message got lost when using contents.find(id). Without doing that, everything works like a charm.
Merge pull request #486 from robinboening/essence_validations

Essence validations
More explicit seeder output.

It is now clear that the message comes from Alchemy.
Changes error on Language from base to public attribute.

If one tried to unpublish the default language, the error message was not shown in the form. By setting the error object to the public attribute will make the error notice visible for the user.

Change lang spec
Changes error on Language from base to default attribute.

If one unchecked the default checkbox of the default language, the page could not be saved, which is absolutely correct. But there was missing a notice for the user. By setting the error object to the default attribute, the notice is now shown for the user in the form.

Fixes language spec
Merge pull request #488 from robinboening/language_notice

Changes error on Language from base to certain attributes
Adds example of `alchemy_roles` method to README
Fixes preview scripts for pages not having jquery.
Fixes position of element status icon.
Compare resources search query to lowercase column value. Closes #493
Set I18n.locale in BaseController. Closes #492

We must not change the app's locale globally.