v1 release! 🎉🎉🎉

Release blog post at https://www.gatsbyjs.org/blog/gatsby-v1/

Added

• Adds Material Blog starter to the list of starters. #1344 @Vagr9K committed with KyleAMathews 4 days ago
• Continuation: WIP update home page with new design #1355 @fk
• Wordpress source plugin and example site #1321 @sebastienfi
• [v1.0] Documentation improvements. #1370 @Vagr9K
• 1.0.0 announcement blog post #1379 @KyleAMathews
• Adds gatsby-transformer-toml to the core. ##1382 @Vagr9K

Fixed

• Update README to make it clearer about deploying to gh pages #1343 @jsfeb26
• Call next() after serving HTML #1349 @levibuzolic
• Use int for defaultValue of int field #1352 @KyleAMathews
• Make default sitemap meet expectations #1351 @chiedo
• Guard against calling ga function if it doesn't (yet) exist #1361 @KyleAMathews
• Namespace type names for Contentful #1374 @KyleAMathews
• Add missing parens in code examples #1376 @okcoker
• Fix gatsby-transformer-react-docgen dependencies #1377 @jquense