[Fix #92] Recommend the use of find_each
Remove mention of update_attribute being deprecated and removed

The method was removed about 2 years ago, but that change has since been reverted: https://github.com/rails/rails/pull/6738#issuecomment-39584005

I also linked the method to its documentation on the RoR API docs: http://api.rubyonrails.org/classes/ActiveRecord/Persistence.html#method-i-update_attribute
Merge pull request #97 from dideler/patch-1

Remove mention of update_attribute being deprecated and removed
Mention gittip
fixed error where it was checking the incorrect object for validation errors
Merge pull request #98 from MunkiPhD/bug-fix-model-test

fixed error where it was checking the incorrect object for validation er...
Change cancan to cancancan
Merge pull request #99 from lukaselmer/fix-cancan

Change CanCan to CanCanCan
Remove gem suggestions and testing sections

Those never really belonged here, so we're all better off without them.
Remove a dead entry from the table of contents
Update link for The Rails Way book

Change from The Rails 3 Way to The Rails 4 Way
Merge pull request #102 from andyw8/patch-1

Update link for The Rails Way book
Added the Russian translation to the translations list.
Merge pull request #104 from arbox/fb_translations_list

Added the Russian translation to the translations list.
Merge branch 'master' of github.com:bbatsov/rails-style-guide