Merge pull request google#49 from mabrains/adding_flake8_file

adding flake8 file

.flake8

@@ -0,0 +1,24 @@
+
+[flake8]
+max-line-length = 88
+max-complexity = 18
+select = B,C,E,F,W,T4,B9
+ignore = E203, E266, E501, W503, F403, F401
+
+exclude =
+    # No need to traverse our git directory
+    .git,
+    # There's no value in checking cache directories
+    __pycache__,
+    # The conf file is mostly autogenerated, ignore it
+    docs/source/conf.py,
+    # The old directory contains Flake8 2.0
+    old,
+    # This contains our built documentation
+    build,
+    # This contains builds of flake8 that we don't want to check
+    dist,
+    .ipynb_checkpoints,
+    .tox,
+    extra,
+    deprecated,