Added errors on file size
Do not display rmagick exception in I18n message

For instance, if you upload a text file with a JPG extension, rmagick generate an exception, whose message contains the full path of your project directory. It seems to me that it's a security issue, since the generated message displayed to the frontoffice user contains the server project directory.
I didn't test other cases (for the orher messages), but potentially this problem can appear somewhere else
Do not retrieve disabled versions
Reset mounter cache on record reload
change MiniMagick.convert to take an additional page number argument and add MiniMagick.convert_all_pages
Convert all pages when no page number is specified
Fix file delete being called twice on remove.

When a file is removed with something like `.remove_image = true` it's
seen as you replacing the file with a new file and still tries to delete
the "old file" even though the old file was just deleted. This is
mitigated in `CarrierWave::SanitizedFile#delete` by an `if exists?`
condition. But it's unnecessary and especially annoying when trying to
use a file storage API.
Fix bug with remove_previously_stored_#{column} callback, when updating in a transaction, and that process is rollback.
The old file will be delete, but the new file name can not store success into database.

## For example:

User.transaction do
  @user.avatar = new_file
  @user.save
  # new file stored
  # old file deleted with callback: remove_previously_stored_avatar
  # ... do bla bla
  raise ActiveRecord::Rollback
end
fixed typo in mini_magick.rb, missing end statement and wrong url to mini_magick github repo
Don't read file twice in sanitized_file

This can cause excess extra traffic and memory usage, especially with
fog. Also remove what seems to be a useless read in the if block and
added some initial specs for sanitized_file.
change gsub when possible
Add a module for supporting multiple files
Pluralize column name
First stab at supporting arrays
Make mounter work with single mount
Fix ActiveRecord integration
Fix removal of previous files
Fix identifiers
Make remaining specs pass
Move back into mount file