Improve language normalization

Check for null before converting to lower case
Add better tests for ambiguous section detection
Fix URL creation on windows
Improve section detection, fixes #68
Merge pull request #77 from GitbookIO/improve/sections_lexing

Improve/sections lexing
Use API from node 0.8
Use OS-agnostic path generation for images too
Merge pull request #78 from mrpotes/mocha-windows

Fix URL creation on windows
Fix title problem when repo url doesn't have .git suffix
Merge pull request #84 from Tim-Zhang/master

Fix title problem when repo url doesn't have .git suffix
Create AUTHORS.md
Update AUTHORS.md
Tabular quiz
Quiz with GFM checkbox lists
Fixup page lexing in test/page
Refactor, document, improve section type detection

Especially for quiz types
Merge pull request #85 from GitbookIO/pr/63

Pr/63
Refactor binary's buildCommand

Be more “commander-like”
Add gitbook init command, fixes #67
Allow scroll in computers that put the navigation over scroll control. When the document is ready it will check the difference between the body-inner and the page-wrapper width to move the layer only this width allowing the user to scroll.