* Cleaned up code and made make_mi (now make_module_instance) method a lot more
generic. It will now find and "make" (i.e transfer from local_attr dictionary to
properly wrapped module members) any submodule, whether its in a list, list of
lists, dictionary, etc

* Fixed module to allow initialization of member modules which are in lists

* TODO: test_matinv is still hardcoded to work for seed=1. Brought back seed of
1 until this is fixed (when THEANO_DEFAULT_SEED is specificed however, this
value will be overriden and the test will fail again)

* Seeding should be done through unittest_tools.set_seed
** seeds with THEANO_UNITTEST_SEED env. var if it is present
** if env. var is not present, it will use the seed provided by the user
** if user provided no seed, it will seed with None (random seed)
* when creating RandomState objects, the parameter should be the return value of
fetch_seed() which will try to get the env. var. seed, if not default to the
user value or None.

* Fixed 2 tests in test_basic which had been hardcoded for a specific seed