Rewritten dependencies and don't use pip as a library

Closes #97, #98

.travis.yml

@@ -4,7 +4,6 @@ python:
   - 3.5
   - 3.6
 install:
-  - pip install -r requirements.txt
-  - pip install lxml coverage codecov
+  - pip install -r travis-requirements.txt
 script: coverage run setup.py test
 after_script: codecov

README.md

@@ -55,11 +55,12 @@ You'll need these to run _Supysonic_:
 * [Python Imaging Library](https://github.com/python-pillow/Pillow)
 * [requests](http://docs.python-requests.org/)
 * [mutagen](https://mutagen.readthedocs.io/en/latest/)
-* [watchdog](https://github.com/gorakhargosh/watchdog)
+* [watchdog](https://github.com/gorakhargosh/watchdog) (if you want to use the
+  [watcher](#watching-library-changes))
 
 You can install all of them using `pip`:
 
-    $ pip install -r requirements.txt
+    $ pip install .
 
 You may also need a database specific package:
 
@@ -218,6 +219,11 @@ print anything to the console. If you want to keep it running in background,
 either use the old `nohup` or `screen` methods, or start it as a simple
 _systemd_ unit (unit file not included).
 
+It needs some additional dependencies which can be installed with the following
+command:
+
+    $ pip install -e .[watcher]
+
 ## Upgrading
 
 Some commits might introduce changes in the database schema. When that's the

requirements.txt

@@ -1,6 +0,0 @@
-flask>=0.11
-pony>=0.7.2
-Pillow
-requests>=1.0.0
-mutagen>=1.33
-watchdog>=0.8.0

setup.py

@@ -14,10 +14,19 @@ import supysonic as project
 
 from setuptools import setup
 from setuptools import find_packages
-from pip.req import parse_requirements
-from pip.download import PipSession
 
 
+reqs = [
+    'flask>=0.11',
+    'pony>=0.7.2',
+    'Pillow',
+    'requests>=1.0.0',
+    'mutagen>=1.33'
+]
+extras = {
+    'watcher': [ 'watchdog>=0.8.0' ]
+}
+
 setup(
         name=project.NAME,
         version=project.VERSION,
@@ -29,13 +38,13 @@ setup(
         url=project.URL,
         license=project.LICENSE,
         packages=find_packages(),
-        install_requires=[str(x.req) for x in
-            parse_requirements('requirements.txt', session=PipSession())],
+        install_requires = reqs,
+        extras_require = extras,
         scripts=['bin/supysonic-cli', 'bin/supysonic-watcher'],
         zip_safe=False,
         include_package_data=True,
-        test_suite="tests.suite",
-        tests_require = [ 'lxml' ],
+        test_suite='tests.suite',
+        tests_require = [ 'lxml' ] + [ r for er in extras.values() for r in er ],
         classifiers=[
             'Development Status :: 3 - Alpha',
             'Environment :: Console',

travis-requirements.txt

@@ -0,0 +1,6 @@
+-e .[watcher]
+
+lxml
+coverage
+codecov
+