Create environment.yml

Allows anyone to create a dev conda environment with 'conda env create' from root directory. This makes getting started easier.

environment.yml

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+name: nibabel-dev
+channels:
+  - defaults
+dependencies:
+  - python>=3.7
+  - pip>=19.3
+
+  # setup
+  - wheel
+  - setuptools>=30.3.0
+
+  # requirements
+  - numpy>=1.12
+
+  # doc requirements
+  - sphinx
+  - numpydoc
+  - matplotlib>=1.3
+
+  # testing
+  - nose>=0.11
+  - mock
+
+  # code style
+  - flake8
+  - pep8-naming
+  - pip:
+    # doc requirements
+    - texext
+
+    # code style
+    - flake8-docstrings