Bump version to v2.0.0

Conflicts:
	README.md
Rename update to selfupdate
Conflicts:
	README.md
Update help to selfupdate
removes the replacement of . => / as that replacement breaks browse for branches like fix-glob-for.js

Conflicts:
	features/browse.feature
Add test for #200

See https://github.com/jingweno/gh/issues/200#issuecomment-38517724
Escape '\n' during split
Conflicts:
	commands/pull_request.go
	commands/utils.go
Split on escaped returns as well
Conflicts:
	commands/utils.go