Fix import

A few improvements to OrderedSet implementation

* Can now construct an OrderedSet from a string
* Potentially more efficient implementation of __iter__() in Python 2.4
* __eq__ behavior in the same in both implementations, and now forbids
  comparison to set to avoid confusing non-symmetric equality relations

Fixed __eq__ and __hash__ of Diagonal Op

Minor stuff

Ready to merge: Determinism 2

Corrected the fully qualified name of RandomState class

places in docstrings.  It was spelled numpy.RandomState instead of
numpy.random.RandomState.

Fix EighGrad that didn't returned the good dtype when the input is float...

Use the real dtype in case of mixed dtype input and work around dtype change depending of numpy version.

This was an error in the buildbot.

Minor fixes (typos)

Fixed a few typos in documentation.