Bump version to 0.2.2
Update README.md
Fix navigation on chrome for iOS: disable pushState
Add editor and twitter links in the readme
Add contributors to package.json and change homepage
Fix #116: update url before updating html content
Fix image path calcul
Update tests for relative images
Fix quiz interractivity
Merge pull request #117 from GitbookIO/fix/99

Fix #99
Add warning about theme
Load css before content
Improve stability of mixpanel tracking
Refactor navigation generation to be functional

This makes it a lot less error prone and far more robust. As well as a
lot easier to understand
Bump version to 0.2.3
Fix #118: fix single page generation when file from summary doesn't exists