Remove empty line with trailing space at the end of routes map

[sashabelozerov]

Fixes #474

Actually, not only fixes issue with trailing space, but removes last empty line (#[EOL]) at the end of routes map completely.

Example:
Instead of

# == Route Map
#
#   Prefix Verb   URI Pattern    Controller#Action
#   root GET       /                    main#index
# [EOL]

Now it will be

# == Route Map
#
#   Prefix Verb   URI Pattern    Controller#Action
#   root GET       /                    main#index

Here is why this empty line occurred in the first place:
rake routes returns text with a new line character at the very end.
AnnotateRoutes treated this last empty line as a useful content and added # [EOL] because of it.

I decided to remove # [EOL], because specs show that it wasn't expected from the beginning. Specs passed only because there was an assumption that rake routes doesn't add new line character at the end, which is wrong.