[ruby-layer] Adding ruby/rspec-verify-directory method for running specs for a specific directory.
[ruby-layer] Adding ruby/rspec-verify-directory method for running specs for a
specific directory.

This commit creates a 'ruby/rspec-verify-directory command, which
prompts for a directory and runs rspec on it. This command is bound to
ruby-modes' keymaps under the "td" keybinding.

tsonntag/dotemacs,tsonntag/dotemacs,tsonntag/dotemacs,tsonntag/dotemacs