Consolidate routers

[MonicaOlejniczak]

A continutation of https://github.com/atlassian-labs/react-resource-router/pull/145 with the following additions:

• Make history prop required on Router as it being optional previously created no reason to use MemoryRouter for testing
• Update SSR example to use Router with a memory history passed into it
• Add hash router example to reproduce https://github.com/atlassian-labs/react-resource-router/issues/111
• Refactor router tests
• Remove unused createLocation function
  • Used in both StaticRouter and UniversalRouter to pass location into bootstrapStore and bootstrapStoreUniversal respectively
  • location is always set to history.location and thus goes unused in bootstrapStore and bootstrapStoreUniversal
  • Remove props.location from Router and prefer history