A few more days, another minor release 😎

Highlight of this release is @felixjung adding support for hot reloading changes to site's html.js during development in #1473

Beyond that, lots of bug fixes and small feature additions from the community!

Added

• Watch for changes to html.js #1473 @felixjung
• Add stylus example #1479 @iansinnott
• Added support for nested img tags in html nodes #1485 @chiedo
• Allow for env files #1462 @okcoker
• Create deploy-gatsby.md #1480 @couturecraigj

Fixed

• Fix Contentful example URL #1483 @oscar-b
• Fix reference to program.directory #1490 @jakedeichert
• Prism plugin bugfix alt #1491 @bvaughn
• Fixes docs referencing removed "1.0" branch source code instead of master. #1495 @Vagr9K
• fix(gatsby-source-contentful): missing host param in createClient #1487 @Smiter
• use program directory over cwd #1478 @craig-mulligan