Recommend bundle exec rake whenever rake is being invoked.

Author: tjgrathwell

Diff for: CONTRIBUTING.md

@@ -27,7 +27,7 @@ maintainers to love you. :heart:*
 
 ## Before Submitting
 
-- Please, please, *please* run `rake` from the terminal before you submit. It
+- Please, please, *please* run `bundle exec rake` from the terminal before you submit. It
   not only runs our test suite but also checks the docs for syntax errors.
 
 - Push to a branch on GitHub. Just like you developed in a local branch, you

Diff for: README.md

@@ -20,7 +20,7 @@ These files can be in any of these formats:
 ## Usage
 
     bundle install
-    rake run
+    bundle exec rake run
 
 If the above fails (say, because `rerun` doesn't work on your system), try
 
@@ -30,13 +30,13 @@ Then open <http://localhost:9292> in a web browser, and verify that you can navi
 
 ## Locales
 
-To serve sites from "sites/en", use `rake run` or a vanilla deploy.
+To serve sites from "sites/en", use `bundle exec rake run` or a vanilla deploy.
 
 To server sites from another locale (say, "es" or Spanish)...
 
 ### Run Localized Site Locally
 
-    $ SITE_LOCALE=es rake run
+    $ SITE_LOCALE=es bundle exec rake run
 
 The server listens on `0.0.0.0:9292`.