Change EPEL yum_repository ex. to use hypothetical Our Co.
Change EPEL yum_repository ex. to use hypothetical Our Co.

Fixes #153

Using yum_repository to define a repo for EPEL is misleading as
users should be using the yum-epel cookbook for that. Here we
redo the example to be a hypothetical company instead.

chef-cookbooks/yum,someara/yum,someara/yum,juliandunn/yum,someara/yum,chef-cookbooks/yum,juliandunn/yum