Allow acces to articles.json without a blog ID
Add tests for articles

Having boxen problems, but this Should Work™
Update from rake/rdoctask to rdoc/task

rake/rdoctask is deprecated
Fix articles tests
Clean up blog tests

Consistancy in fixtures/fix the test
Fix blog test

L2fakeweb.
@jduff this should address the comment you had.
Merge pull request #46 from Shopify/article-endpoint-update

Allow acces to articles.json without a blog ID