* add checkpoint test to verify it reloads from disk
Merge pull request #23 from fegin/master

Make a new Expr type for reshape.
* change print z.glom to assert
* change log to Marking worker * as failed
Merge pull request #22 from MaggieQi/master

* add checkpoint test to verify it reloads from disk
Add write expression.
  - Now we can do array[sslices] = data[dslices]. array and data
    can have different shapes but array[sslices] and data[dsslices]
    must have the same shape.
  - make_from_numpy now uses write expression.