Move developer dependencies to a requirements-dev.txt file.

Fixes #56

README.md

@@ -71,6 +71,19 @@ Translators can join the fun by translating at the
 Additional translation details are in the[translation
 documentation](http://handroll.readthedocs.org/en/latest/i18n.html).
 
+Want to write some code?
+Running these commands should set up your environment
+with all the tools you need to contribute.
+
+```bash
+$ # Start from the root of a handroll clone.
+$ virtualenv venv                            # Create your virtual environment.
+$ source venv/bin/activate                   # Activate it.
+(venv)$ pip install -r requirements-dev.txt  # Install developer tools.
+(venv)$ pip install -e .                     # Install handroll in editable mode.
+(venv)$ nosetests                            # Run the test suite.
+```
+
 [pypishield]: https://img.shields.io/pypi/v/handroll.svg
 [license]: https://img.shields.io/pypi/l/handroll.svg
 [shield]: https://img.shields.io/pypi/dm/handroll.svg

requirements-dev.txt

@@ -0,0 +1,9 @@
+Babel
+coverage
+flake8
+nose
+requests
+Sphinx
+tox
+twine
+wheel

setup.py

@@ -56,20 +56,6 @@ def run(self):
         'werkzeug',
     ]
 
-    # Add some developer tools.
-    if 'develop' in sys.argv:
-        install_requires.extend([
-            'Babel',
-            'coverage',
-            'flake8',
-            'nose',
-            'requests',
-            'Sphinx',
-            'tox',
-            'twine',
-            'wheel',
-        ])
-
     setup(
         name='handroll',
         version=__version__,