Remove end p tag in installing page.
fix typo in protip
Merge pull request #1 from test-kitchen/an-typo

Fix typo in protip
Introductory words.
Fixing a few typos, and enhancing readabilty.
Tidying and improving.
Adding pro tip about portability.
Adding some resources.
2009 joke
Overview for intro
Merge branch 'master' of github.com:test-kitchen/kitchen-docs
Small typo.
Clarify meaning.
previously on Real World: KitchenCI...
Merge branch 'develop' of github.com:test-kitchen/kitchen-docs into develop