Paper trail

[ortegacmanuel]

This PR

• Adds versions functionality on top of paper_trail. This functionality is only available for superadmin. Thanks to this superadmins can easily see resource versions and they are able to restore them
• Adds a new rails generator that helps easily to update styles on main app from latest version on inline_forms gem
• Adds a new rails generator that helps easily to update initializers on main app from latest on inline_forms gem

When you install this version of inline_forms on you app, in order to get it working you need to

• Add new routes to your resources

  get 'list_versions', :on => :member
  get 'close_versions_list', :on => :member 

• Import rails railties:install:migrations and run rails db:migrate migrations. The migration is needed because of this https://github.com/airblade/paper_trail#3c-diffing-versions In few words this is needed in order to save what changes form version to version.

[ortegacmanuel]

@acesuares Major changes after our conversation about this PR are:

• Removed the generators, they overwritten file in the host/main app..no a good idea because it could overwrite some valuable changes maid in the main app..as the background in papiamentu.info

• Instead of using generators to overwrite files in the main app, now the gem loads its own assets and initializers, this is great because it make more ease the actualization, isolates gem code and what ever you want to overwrite or configuration, you can do it manually in the main app because anything in the main app always takes precedence over the engines.

• In order to easily load files from the engine, they have to be in a convention folder structure, this is why you will find new folders and see that the inline_forms is getting a new folder structure, all these I'm doing following instructions here http://guides.rubyonrails.org/engines.html