Initial release
Robust CLI error handling

Fixes #528, fixes #524, fixes #518
Merge pull request #530 from GitbookIO/fix/cli-error-handling

Robust CLI error handling
Merge pull request #506 from Nijikokun/feature/clarity-midnight

Clarity: Midnight Theme (Night)
Add 1.4.2's changes
Bump version to 1.5.0
Merge branch 'master' of github.com:GitbookIO/gitbook

Conflicts:
	theme/assets/style.css