Flake8, Semver, Pre-commit

* Added pre-commit: http://pre-commit.com
* Fixed flake8 errors
* Added flake8 pre-commit hooks
* Added pre-commit to Makefile
* Changed VERSION numbering
* Changed versioning to match PEP-0440

setup.py

@@ -4,8 +4,10 @@ from pip.req import parse_requirements
 # parse_requirements() returns generator of pip.req.InstallRequirement objects
 
 try:
-    install_reqs = parse_requirements("requirements.txt", session=pip.download.PipSession())
-    test_reqs = parse_requirements("test-requirements.txt", session=pip.download.PipSession())
+    install_reqs = parse_requirements(
+        "requirements.txt", session=pip.download.PipSession())
+    test_reqs = parse_requirements(
+        "test-requirements.txt", session=pip.download.PipSession())
 except AttributeError:
     install_reqs = parse_requirements("requirements.txt")
     test_reqs = parse_requirements("test-requirements.txt")
@@ -28,17 +30,15 @@ extendable, so new algorithms and sources can be used.
     author='J. Fernando Sanchez',
     author_email='balkian@gmail.com',
     url='https://github.com/gsi-upm/senpy',  # use the URL to the github repo
-    download_url='https://github.com/gsi-upm/senpy/archive/{}.tar.gz' .format(__version__),
+    download_url='https://github.com/gsi-upm/senpy/archive/{}.tar.gz'.format(
+        __version__),
     keywords=['eurosentiment', 'sentiment', 'emotions', 'nif'],
     classifiers=[],
     install_requires=install_reqs,
     tests_require=test_reqs,
-    setup_requires=['pytest-runner',],
+    setup_requires=['pytest-runner', ],
     include_package_data=True,
     entry_points={
-        'console_scripts': [
-            'senpy = senpy.__main__:main',
-            'senpy-cli = senpy.cli:main'
-            ]
-        }
-)
+        'console_scripts':
+        ['senpy = senpy.__main__:main', 'senpy-cli = senpy.cli:main']
+    })