fix relative links in gh-pages

[0.20.0] Bump version numbers

master and latest

version 0.20.0-rc1

[0.20.0-rc] Bump version numbers

[0.19.0] Bump version numbers

[0.19.0-rc] Bump version numbers

Revert "Dont call npm before node is available"

This reverts commit 7ecb693.

This breaks Xcode build, see discussion on facebook#5156

[0.18.0-rc] Bump version numbers

[0.17.0] Bump version numbers