feat(typescript): add type definitions for modules (#22)

feat: remove .mjs support (see #17)

fix: flow 0.101 errors

* fix: fix flow error

* fix(utils): fix flow error

* chore: update dependencies

* test: add flow def test files

* test(add new test example):

* chore(test): remove example

* fix(package.json): replace import

* Revert "fix(package.json): replace import"

This reverts commit 087e4f5.

* chore: update dependencies

* build: reassemble yarn lock for fixing travis ci checks

* ci: change node 9 -> 10

fix(server): clearTimeout before resolver or reject

fix: catch fetch errors (#11)

If the fetch fails (e.g. due to hostname resolution failure), the promise is not rejected until the 30 second timeout.

Wrapping this in a try/catch allows the promise to be rejected instantly.

fix: change relay-runtime to react-relay package in peerDependencies

Mostly developers install `react-relay` package (which includes
relay-runtime). So hide annoying warning on package install.

feat: move logic of "ensure async resolution inside of QueryRenderer"…

… to server.getCache() method

ci(Travis): change `npm run` on `yarn`

fix: move repo to `relay-tools` organization

fix: npm problem with partially published previous version