Major Changes
- Added lerna version to update_version.sh: f413957
- Added lerna publish script in travis.yml file. Closes #538.: 2c2a9dc
- Hydrated variables and headers in query effect.: 3809b50
- Added backers and sponsors to docs. Closes #539.: 5441a41
- Implemented GraphQL multipart request spec for file upload. Closes #537. Hydrated headers. Closes #341.: c9f49c6
- Added contributors to docs. Closes #539.: 6bfeef6