Bump shell-quote, gatsby, gatsby-plugin-layout, gatsby-plugin-manifest, gatsby-plugin-postcss, gatsby-plugin-react-helmet, gatsby-plugin-sharp, gatsby-plugin-styled-components, gatsby-source-filesystem, gatsby-transformer-sharp and gatsby-plugin-remove-trailing-slashes

Bump shell-quote, gatsby, gatsby-plugin-layout, gatsby-plugin-manifest, gatsby-plugin-postcss, gatsby-plugin-react-helmet, gatsby-plugin-sharp, gatsby-plugin-styled-components, gatsby-source-filesystem, gatsby-transformer-sharp and gatsby-plugin-remove-trailing-slashes #177