totalHydrated can be an empty array

If totalHydrated was an empty array, the condition was passing since in
javascript:

  js> !![]
  true

This checks if totalHydrated has at least one element.
Merge pull request #52 from fusionbox/fix-empty-totalhydrated

totalHydrated can be an empty array
Huge overhaul for the ember 1.0 readme
Upgraded to ember.js 1.1.2 and the latest ember-data 1.0 beta (master)
Another readme update
Greatly simplified the tests by creating a default route (no longer sessions)
The adapter now requires nested objects post to non nested endpoint (see issue #56)