add gitignore, environment.yml

.gitignore

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

environment.yml

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