Merge pull request #393 from robinboening/master

Scopes last edited pages in admin/dashboard to current site. Closes #392
Adds a Getting Help section to README
Added IRC chan info
Better ajax response handling in dialogs.

- Unauthorized requests now returns a 403 status.
- If the request returns javascript the dialog body gets emptied.
- Only html responses are placed into the dom.
Compresses 2.6 migrations
v2.7.0.rc1
Fixes bug in upgrader that creates languages, where it shouldn't.
Showing a spinner while importing the database from server.
Fixes database import Rake task and Capistrano recipe
Fixes a bug in 500 error view, where sometimes the alchemy routing proxy could not be found.
Removes the page info tooltip and add a overlay window instead.

This increases the rendering speed of the sitemap and adds possibilities to show even more infos of that page.
<hr> styling
Do not render element hint icon if element is trashed.
Only send user credentials via mail, if the value is from checkbox.
Fixes bug in Content#create_from_scratch that does not allow to create a content from essence_type.
Move shared essence partials into `views/alchemy/essence/shared` folder.
Updates jquery-rails gem.
Refactors the loading of external libraries and Alchemy mixins.

Basically we don't require everything at boot time anymore.
Only the global stuff, like other engines is loaded at boot time.
All other stuff gets required where its needed.

This gives several advantages:

* Faster boot up time. Especially while running single tests.
* Possibility to introduce a reduced faster spec helper.
* Clearer view on dependencies of classes. Especially in models.
Introduces a fast_specs helper.

This reduced faster spec helper, runs your specs without any extra stuff.

Just require 'fast_specs' in your specs instead of 'spec_helper'.
JSONify options params while passing them around between ruby and javascript.

This fixes some weird url parsing bugs in jQuery and finally drops the requirement for `HashWithIndifferentAccess` in `EssencePicture#edit` view.