gatsby 0.12.4

DX improvements 🎉🎉🎉

on Node.js NPM

• @tsunammis added support for importing files with query parameters #398
• @benstepp changed path creation so that starting and trailing slashes are automatically added as this is a common problem and is easy to programmatically fix instead of just telling users to fix it themselves.

Sites launched on Gatsby since the last release

• http://codefellows.com
• http://outcomes.com
• http://ollieglass.com