Fix progress link to README
Add new lateral navigations
Improve new navigation on mobile
Fix display of table in page body
Don't use caching for search index
Center images in markdown body
Bump version to 0.1.2
Make use of github optional
Whoops, missed a couple of extra uses of githubId
Fixes --githubHost option for use with Github Enterprise.
Merge pull request #51 from calmdev/fix/gh-enterprise

Fixes --githubHost option for use with Github Enterprise.
Tidy up use of github, and make error more descriptive
Fix URL rewriting error on empty URLs

Fixes #54, fixes #59
Add lexing support for content code in exercises

#52, #49, #46
Add context code support to exercises (optional)

Partial #52, fixes #49, fixes #46
Uglify output JS theme/assets/app.js
Bump version to 0.1.3
Merge branch 'optional-github' of https://github.com/mrpotes/gitbook into mrpotes-optional-github
Merge Optional github
Revealable page segments