setup: add dev dependencies

closes #21

scripts/setup-hooks.sh

@@ -21,8 +21,3 @@ create_hook() {
 echo '\n#### Copying hooks into .git/hooks'
 create_hook 'post-commit'
 create_hook 'pre-push'
-
-echo '\n#### Installing linter/test dependencies\n'
-pip install pycodestyle pytest-sugar
-pip install https://github.com/williballenthin/vivisect/zipball/master
-python setup.py develop

setup.py

@@ -51,6 +51,13 @@ setuptools.setup(
     },
     include_package_data=True,
     install_requires=requirements,
+    extras_require={
+        'dev': [
+            'pytest',
+            'pytest-sugar',
+            'pycodestyle',
+        ]
+    },
     zip_safe=False,
     keywords='capa',
     classifiers=[