fix(babel): fix babel preset options caching

Babel preset options were cached mistakenly between server and client
compiles.

Fixes ream/ream#140

feat: html-minifier integration

Closes ream/ream#138

refactor: unify error rendering between client and server

fix: return HTTP 500 on unhandled errors during SSR

Fix #133. Add regression tests.

fix: use custom terser-webpack-plugin setup

Cherry-picked from and closes #131.

fix: sync @types/webpack-chain version

fix: actually publish type defs

feat: Typescript definitions

This adds certain @types/*** to package.json "dependencies".
The rationale is explained here:
microsoft/types-publisher#81

fix: prevent multiple rebuilds on `ream dev` start

Fixes #124

fix: fix client-side getInitialData redirects

Fixes #121 and #118. Improves handling of unhandled errors.