Add active_admin assets to precompile list in engine

[jschwindt]

This pull request solves the problem of adding active_admin assets in the application. What is does is configuring the engine to add them to the precompile list so the application using ActiveAdmin does not need to do it.

Related issue: #483

[pcreux]

This is great, and will help a lot of people deploying their active admin app!

Could you make sure that it would work when using Rails 3.0.0?

[jschwindt]

Hi, Philippe.

I've just updated the pull request to ensure that it doesn't affect Rails version 3.0.x.

Juan.

[pcreux]

Cool, thanks!

[tsongas]

I'm a Rails newbie using ActiveAdmin for the first time, unfortunately this fix didn't keep me from having to add the following to application.rb in order for my site to run on Heroku (after pulling some hair out I might add):
config.assets.precompile += ['active_admin.css', 'active_admin.js', 'active_admin/print.css']
Not sure if I'm doing something wrong elsewhere....

[exviva]

@tsongas this was fixed by #1910, but still not released, so you'd need to use the master branch.

[seanlinsley]

@tsongas which you can do by putting this in your Gemfile:

gem 'activeadmin', github: 'gregbell/active_admin'

[akshayrawat]

This is released in 0.6.0. Issue can be closed.