Remove exclusionary gendered constants GENDERS

To improve the guide, replace the constants example with something
that doesn't exclude a class of people.
Updated minimagick URL
Merge pull request #125 from JRice/master

Updated minimagick URL
Merge pull request #123 from cabrera/improve_example

Replace exclusionary constants example GENDERS
Reordered the list of translations.
Merge pull request #128 from arbox/fb_correct_order

Reordered the list of translations.
Merge branch 'master' of https://github.com/bbatsov/rails-style-guide