Implemented Pingr with Specs

Closes #21
Removed migration files from dummy app too - Fixes #22
Merge branch 'feature/SearchEnginePing'
Updated README about Pingr
Releasing v0.7.0
Added a Gem Version badge to README.md
Added CodeClimate badge to the README.md
Added Gemnasium badge to README.md
Fixed link to Code Climate in README.md
Remove post-tagging

Conflicts:

	app/controllers/blogit/posts_controller.rb
	config/routes.rb
Always paginate post index

In addition to just being a good idea, (the data returned shouldn't depend on
the format it was requested in) this is was fixes an interaction with mobile-fu
when it would cause the response format to be "mobile" instead of "html".