Remove inflector rule that makes commits uncountable

Signed-off-by: Dmitriy Zaporozhets dmitriy.zaporozhets@gmail.com

Before:

>> "commits".singularize
=> "commits"
>> "commit".pluralize
=> “commits”

After:

>> "commits".singularize
=> "commit"
>> "commit".pluralize
=> “commits”

cc @rspeicher