code in a mess, but gemm-optimization works on more systematic test cases including josephs NAACL graph

fixed a bug with random number generation by submodules. See Oliviers email to theano-dev for details.

now you must give the --debug option to be in debug mode. This will be usefull as the file that don't use this main, will have the same default and we should be able to use it everywhere without trouble.

made the import work for "python test_logistic_regression.py" and for "nosetests test_logistic_regression.py"

instead of using Join for scalar values

added a JOSEPHS_BUG_SOLVED global variable to tensor.blas that disables dot22 and gemm optimizations

refactored gemm-related code. added gemm-related optimizations and tests. added specializations for mul

added a main method for test. That way we don't need to change code in each test_file.py fi we want to change what it do if we call it directly.