Added Specky for rspec highlighting outside spec/

If you have rspecs anywhere else (say fast_spec/), the
default rails.vim highlighting doesn't affect them. Added
Specky to do this. Specky is not currently enabled in any other
way (we will still use ruby-vim-conque to run tests, but Specky
will do highlighting/file detection).

README.md

@@ -443,6 +443,7 @@ files contain key mappings as well (TODO: probably will move them out to skwp-ke
  * vim-indent-guides - visual indent guides, off by default
  * color_highlight - use :ColorCodes to see hex colors highlighted
  * change-inside-surroundings - change content inside delimiters like quotes/brackets
+ * Specky - used for color highlighting rspec correctly even if specs live outside of spec/ (rails.vim doesn't handle this)
 
 #### General enhancements that don't add new commands