Removes selectBoxIt and adds select2 for select box replacement. [WIP]
Adds style overrides for tiny selectbox and selects in forms.
Updates select2 styling to fit into Alchemy GUI.
Change the minimum list items for search setting of select2.

Select2 has this great feature to only display the search if a minimum amount of list items are present.
Ensures that we redirect to login form, if the current_alchemy_user is nil.
Revert "Ensures that we redirect to login form, if the current_alchemy_user is nil."

This reverts commit b05d98a3407b8d9a27df806ee5b3361900baeb45.
Use content as local variable in essence views again.

We cannot use the partial name, this causes a lot of problems with existing helpers and specs.
Refactors admin/contents_helper
Fixes errors attachments controllers and template tracker specs
Fixes essence view specs.
Changes how the pages controller gets the layout to render.

No more class method, instead the layout_for_page method gets called in render call.
Fixes pictures controller spec.
Fix cells factory name attribute.
Refactors the render_elements helper.
Refactors render_element helper.
Use render_page_layout in pages#show, to have the standard layout fallback working.