move simulation under dream

This creates a dream.simulation namespace

dream/simulation/__init__.py

+# See http://peak.telecommunity.com/DevCenter/setuptools#namespace-packages
+try:
+    __import__('pkg_resources').declare_namespace(__name__)
+except ImportError:
+    from pkgutil import extend_path
+    __path__ = extend_path(__path__, __name__)

setup.py

@@ -16,7 +16,7 @@ setup(
     entry_points=("""
     [console_scripts]
     dream_platform=dream.platform:main
-    dream_simulation=simulation.LineGenerationJSON:main
+    dream_simulation=dream.simulation.LineGenerationJSON:main
     """),
     include_package_data=True,
     zip_safe=False,