Add __init__.py file to have more tests installed with Theano.

This allow theano.tests() to run more tests!

Add init.py file to have more tests installed with Theano.
e6720ee9 · Frederic Bastien · Alexander Belopolsky · 9fbfae94 · e6720ee9 · e6720ee9
--- a/theano/misc/tests/__init__.py
+++ b/theano/misc/tests/__init__.py
--- a/theano/sandbox/linalg/tests/__init__.py
+++ b/theano/sandbox/linalg/tests/__init__.py
--- a/theano/scan_module/tests/__init__.py
+++ b/theano/scan_module/tests/__init__.py