Translated the entire thing to Spanish

Being from Latin America myself, I thought it would apply. :)

I may have made a *couple* of mistakes here and there with the
accents (´). :P

Also I didn't do anything special with formatting, so if I need
to fix anything please say so. :)
Fixed a little thing in the es.yml file
OK last typo translation fix

...hopefully...
Merge pull request #198 from Greduan/patch-1

Finished 100% the es.yml file
gemfile cleanup

rename testing group to test, to skip on heroku
move coveralls to test group
Added keyboard shortcut to add-feed

* Used the BIG_FREE_READER shortcut of 'a' to add-feed.
* I only added the en.yml localization.
* I didn't see any tests for shortcuts, so didn't add one.
Updated keyboard shortcuts screenshot
Merge pull request #201 from queuebit/master

Add 'a' keyboard shortcut to add-feed
update translations
fix es.yml
Prevent n+1 queries when serializing stories to json
Merge pull request #202 from ejfinneran/perf-fix

Prevent n+1 queries when serializing stories to json
Added debug page with Ruby version
Added user agent to debug
Added queued job count to debug
Fixed typo
update translations
add failing test case to reproduce #203
gsub out <wbr> tags
Handle rspec LoadError when bundle-ing without dev/test