Use Globalize ~>3.0.0 instead of Globalize3

Globalize3 has been renamed "Globalize" as stated by this warning:

"HEADS UP! Globalize3 has been renamed "Globalize" and now supports both
ActiveRecord 3.x and ActiveRecord 4. To use the new gem with ActiveRecord
3.x, replace "gem 'globalize3'" with "gem 'globalize', '~> 3.0.0'" in your
Gemfile.

All future updates to the ActiveRecord 3.x version of Globalize will happen
in versions 3.x of the new gem (globalize). globalize3 is deprecated and will
no longer be updated."

This just use the new gem and the secure URL of rubygems.org to pull gems from.

Note: All tests pass