This is a follow-up of PR #32.

General:
- Refactor tests:
  - Namespace all tests into their separate packages (for better
    organization of the output), including a subspace for middleware
  - Rename `expect` function to `waitFor` in all calls to
    testAsyncMulti(), to better reflect its behavior
- Copy .jshintrc into new packages

json-routes:
- Export RestMiddleware object for middleware packages to have a
  namespace to declare themselves within
- Add a `JsonRoutes.middleware` to eventually replace
  `JsonRoutes.middleWare` (since 'middleware' is one word)
- Update change log
- Remove 100 character line limit in README

rest-accounts-bearer-token:
- Split rest-accounts-bearer-token middleware package into a middleware
  package that parses a standard bearer token (rest-bearer-token-parser)
  and one that validates an auth token and sets the request.userId to
  the authorized Meteor.user's ID (authenticate-meteor-user-by-token)
- Attach middleware to RestMiddleware namespace, instead of adding it to
  every route. This allows middleware to be made available by simply
  adding its package. It can later be added to the middleware stack with
  JsonRoutes.middleware.use('path', RestMiddleware.<middlewareFunction>).
- Move tests to their appropriate package

simple-rest:
- Add token and auth middleware in tests to pass auth tests
  - This could be a sign that auth tests may be better suited in the
    corresponding middleware packages

rest-accounts-password:
- Use the latest version of json-routes (1.0.3)
- Add token parsing and auth middleware to the stack (currently added to
  all routes, which is bad - needs fix)

Add error handling middleware