Added a configurable option for pjax

Some actions, like logging in as another user, should be rendered
in the app, not via pjax.  This change allows an action to indicate
how it should be rendered.
Remove copyright notice and footer
breadcrumbs fix
Update app/views/rails_admin/main/_form_filtering_select.html.haml

fix layout issue - buttons should appear to right of select element
Merge pull request #1486 from charlieschwabacher/master

Fix layout issue for associations in edit forms
Merge pull request #1487 from ai/jquery19

jQuery 1.9 compatibility
Merge pull request #1485 from dalpo/boostrap-breadcrumbs

Bootstrap breadcrumbs visualization fix
Merge pull request #1480 from stephendavis89/patch-2

Remove copyright notice and footer
Bump version to 0.4.2
Fix jQuery 1.9  parse error
Merge pull request #1489 from gokure/master

Fix $(html) parse error for jQuery 1.9
fix double loading of assets in dev mode, fix jQuery 1.9 integration, freeze remotipart js to a jQuery 1.9 compatible version, update & fix timepicker for jQuery 1.9 compatibility
rename *.css.scss -> *.scss
Bump version to 0.4.3
remove useless files [ci skip]
Add bundler development dependency
require 'rails_admin/version'

Because require hashes based on the string, not the expanded path of the
file, it's important that we require the version file the same way that
it will be required elsewhere to avoid constant warnings.
Use of custom objects is not necessary here
Add cryptographic signature
Ignore signing key when not building

Closes #1503.