add lumbar chapter
Merge branch 'gh-pages' of github-beastridge:addyosmani/backbone-fundamentals into gh-pages

Conflicts:
	index.md
Add thorax chapter
Remove TODO note
Remove merge conflict comment
Remove a tag from title
Tidy comments
Removing chapter on Sinatra, MongoDB, Haml with Backbone
Removing existing chapter on REST. We'll replace this later.
Typo correction.
Adding new exercises, refactoring index
Fixes #231
Fixes #232
Practical -> Exercise
Add Thorax chapter closing section.
Merge pull request #224 from eastridge/gh-pages

Add Lumbar and Thorax chapters
Merge commit 'd58c5817790bc937596096707eec6b4089507378' into gh-pages

* commit 'd58c5817790bc937596096707eec6b4089507378':
  Removing chapter on Sinatra, MongoDB, Haml with Backbone
Merge commit 'd9bd808050fb2e5ce9e2a3c8ba6025fcd520df77' into gh-pages

* commit 'd9bd808050fb2e5ce9e2a3c8ba6025fcd520df77':
  Removing existing chapter on REST. We'll replace this later.
Merge commit '1767eb4b1a594732c37e20a8a0266f3548b7695c' into gh-pages

* commit '1767eb4b1a594732c37e20a8a0266f3548b7695c':
  Adding new exercises, refactoring index
Merge commit '057e3e0e41cab907de406550832976c6df25e6af' into gh-pages

* commit '057e3e0e41cab907de406550832976c6df25e6af':
  Fixes #231