put various dependencies into setup.py

.travis.yml

@@ -21,10 +21,8 @@ matrix:
         - python: 2.7
         - env: LINT="pylama -l pylint"
 install:
-    - if [[ `python -c "import sys; print(int(sys.version_info < (2, 7)))"` == "1" ]]; then pip install --use-mirrors unittest2; fi
-    - pip install -v --use-mirrors .
-    - if [[ $TEST ]]; then pip install --use-mirrors coverage coveralls; fi
-    - if [[ "$LINT" ]]; then pip install --use-mirrors pylama py3kwarn clonedigger html2rest; fi
+    - if [[ $TEST ]]; then pip install --use-mirrors .[travis]; fi
+    - if [[ "$LINT" ]]; then pip install --use-mirrors .[lint]; fi
 before_script:
     - python symlinkcdll.py
     - PYSTACIA_LOG=1 python -c "from pystacia.api import get_dll; get_dll(False)"

setup.py

@@ -24,6 +24,7 @@
 from setuptools.command.install import install
 from distutils.command.build import build
 from setuptools import setup
+from sys import version_info
 
 environ['PYSTACIA_SETUP'] = '1'
 import pystacia
@@ -207,6 +208,18 @@ def run(self):
 long_description = readme.read()
 readme.close()
 
+test_require = ['nose', 'coverage']
+if version_info < (2, 7):
+    test_require.append('unittest2')
+
+travis_require = test_require + ['coveralls']
+
+docs_require = ['sphinx']
+
+dev_require = test_require + docs_require + ['ipython']
+
+lint_require = ['pylama', 'py3kwarn', 'clonedigger', 'html2rest']
+
 setup(
     name='pystacia',
     description='Python raster imaging library',
@@ -218,6 +231,14 @@ def run(self):
     license='MIT License',
     long_description=long_description,
     install_requires=install_requires,
+    extras_require={
+        'test': test_require,
+        'travis': travis_require,
+        'lint': lint_require,
+        'docs': docs_require,
+        'dev': dev_require,
+        'lint': lint_require
+    },
     cmdclass=cmdclass,
     classifiers=[
         'Development Status :: 4 - Beta',