updated README
more wordsmithing
fixed auth-flow example
Remove currentHandlerInstance property from routers
Preserve window.location.pathname when replacing hash

Also consolidated related logic in functions for better locality.
Use ActiveStore to sync .active Link state

Also refactored Router to more clearly delineate between Routers
and routes.

Fixes #27
add failing test
#29 | test should check prop value
Add spec for ActiveStore
Separate out Route into its own class

Also, fixed failing tests.

Fixes #29