Summary:
Pull Request resolved: https://github.com/facebook/flipper/pull/878
1) Enabled eslint error reporting for unresolved imports and fixed all the errors
2) Enabled eslint for typings (d.ts) and fixed all the errors
Reviewed By: passy
Differential Revision: D20335151
fbshipit-source-id: 7b142281a406b32df0f02a5cd0d7d05eba941acd