sync with upstream

.gitignore

@@ -11,5 +11,3 @@ my_*
 datasets/words
 datasets/flowers
 datasets/spam
-*.gz
-datasets/mnist/train-labels-idx1-ubyte

environment.yml

@@ -1,16 +0,0 @@
-name: handson-ml
-dependencies:
-- python=3.5
-- jupyter
-- matplotlib
-- numexpr
-- numpy
-- pandas
-- Pillow
-- psutil
-- scikit-learn
-- scipy
-- sympy
-- pip:
-  - tensorflow
-  - watermark