improve dependency management in setup.py

setup.py

@@ -11,10 +11,7 @@ here = os.path.abspath(os.path.dirname(__file__))
 with open(os.path.join(here, 'README.txt'), encoding='utf-8') as f:
     long_description = f.read()
 
-scripts = ["mitmdump", "mitmweb"]
-if os.name != "nt":
-    scripts.append("mitmproxy")
-
+# Core dependencies
 deps = {
     "netlib>=%s, <%s" % (version.MINORVERSION, version.NEXT_MINORVERSION),
     "pyasn1>0.1.2",
@@ -25,7 +22,8 @@ deps = {
     "pyparsing>=1.5.2",
     "html2text>=2015.4.14"
 }
-script_deps = {
+# A script -> additional dependencies dict.
+scripts = {
     "mitmproxy": {
         "urwid>=1.3",
         "lxml>=3.3.6",
@@ -34,14 +32,29 @@ script_deps = {
     "mitmdump": set(),
     "mitmweb": set()
 }
-for script in scripts:
-    deps.update(script_deps[script])
+# Developer dependencies
+dev_deps = {
+    "mock>=1.0.1",
+    "nose>=1.3.0",
+    "nose-cov>=1.6",
+    "coveralls>=0.4.1",
+    "pathod>=%s, <%s" % (version.MINORVERSION, version.NEXT_MINORVERSION),
+    "countershape"
+}
+# Add *all* script dependencies to developer dependencies.
+for script_deps in scripts.values():
+    dev_deps.update(script_deps)
+
+# Remove mitmproxy for Windows support.
 if os.name == "nt":
+    del scripts["mitmproxy"]
     deps.add("pydivert>=0.0.7")  # Transparent proxying on Windows
 
-console_scripts = [
-    "%s = libmproxy.main:%s" % (s, s) for s in scripts
-]
+# Add dependencies for available scripts as core dependencies.
+for script_deps in scripts.values():
+    deps.update(script_deps)
+
+console_scripts = ["%s = libmproxy.main:%s" % (s, s) for s in scripts.keys()]
 
 setup(
     name="mitmproxy",
@@ -75,15 +88,7 @@ setup(
         'console_scripts': console_scripts},
     install_requires=list(deps),
     extras_require={
-        'dev': [
-            "mock>=1.0.1",
-            "nose>=1.3.0",
-            "nose-cov>=1.6",
-            "coveralls>=0.4.1",
-            "pathod>=%s, <%s" %
-            (version.MINORVERSION,
-             version.NEXT_MINORVERSION),
-            "countershape"],
+        'dev': list(dev_deps),
         'contentviews': [
             "pyamf>=0.6.1",
             "protobuf>=2.5.0",