All test was passing without this, so the no downcast is also checked elsewhere
but it is safer to do it before the downcast then recover somewhere later.

added some defensive programming

shape

TST: test CURAND rng when shape is a Variable

Also renamed several arguments to make them less verbose.

This makes the tests pass but nosetests still segfaults.

Added "theano-cache list" to list the content of the theano cache

Minor fixes

Add tests for all the branches involving Variable that weren't tested
and thus not catching that Variable was undefined.

More generic get_test_value

This makes 'get_test_value' work on any object that can turned into a
variable automatically, not just numpy ndarrays.

Curand rng pep8

Might as well not toss new code into the trunk that doesn't respect
PEP8, nevermind fixing old code.

This leaves alone C code with lines longer than 80 characters.

A poster child for unit testing (or at least running pyflakes).

Curand fix

'warn' or 'ignore'

This lift one of the multiple problem that prevent the use of DebugMode.

reduces # of cases where Rop succesfully runs
on invalid input
complete safety would require use of Assert op
which disrupts optimizations, so not done for now

Added the get_test_value function