Get rid of requirements-pip.txt

While pinning setuptools/pip versions is still somewhat desirable, we
can't pin it everywhere easily, and the current solution will break
stuff on Windows.

misc/requirements/requirements-pip.txt

@@ -1,2 +0,0 @@
-pip==8.1.2
-setuptools==28.7.1

scripts/dev/ci/appveyor_install.py

@@ -61,8 +61,7 @@ except (OSError, IOError):
 print("Installing PyQt5...")
 subprocess.check_call([r'C:\install-PyQt5.exe', '/S'])
 
-print("Installing pip/tox")
-pip_install(r'-rmisc\requirements\requirements-pip.txt')
+print("Installing tox")
 pip_install(r'-rmisc\requirements\requirements-tox.txt')
 
 print("Linking Python...")

tox.ini

@@ -15,7 +15,6 @@ setenv =
     PYTEST_QT_API=pyqt5
 passenv = PYTHON DISPLAY XAUTHORITY HOME USERNAME USER CI TRAVIS XDG_* QUTE_*
 deps =
-    -r{toxinidir}/misc/requirements/requirements-pip.txt
     -r{toxinidir}/requirements.txt
     -r{toxinidir}/misc/requirements/requirements-tests.txt
 commands =
@@ -93,7 +92,6 @@ commands =
 [testenv:vulture]
 basepython = python3
 deps =
-    -r{toxinidir}/misc/requirements/requirements-pip.txt
     -r{toxinidir}/requirements.txt
     -r{toxinidir}/misc/requirements/requirements-vulture.txt
 setenv = PYTHONPATH={toxinidir}
@@ -137,7 +135,6 @@ commands =
 basepython = python3
 passenv =
 deps =
-    -r{toxinidir}/misc/requirements/requirements-pip.txt
     -r{toxinidir}/misc/requirements/requirements-pyroma.txt
 commands =
     {envdir}/bin/pyroma .
@@ -146,7 +143,6 @@ commands =
 basepython = python3
 passenv =
 deps =
-    -r{toxinidir}/misc/requirements/requirements-pip.txt
      -r{toxinidir}/misc/requirements/requirements-check-manifest.txt
 commands =
     {envdir}/bin/check-manifest --ignore 'qutebrowser/git-commit-id,qutebrowser/html/doc,qutebrowser/html/doc/*,*/__pycache__'
@@ -156,7 +152,6 @@ basepython = python3
 whitelist_externals = git
 passenv = TRAVIS_PULL_REQUEST
 deps =
-    -r{toxinidir}/misc/requirements/requirements-pip.txt
     -r{toxinidir}/requirements.txt
 commands =
     {envpython} scripts/link_pyqt.py --tox {envdir}
@@ -169,7 +164,6 @@ commands =
 # fail if we didn't have a fallback defined.
 basepython = {env:PYTHON:}/python.exe
 deps =
-    -r{toxinidir}/misc/requirements/requirements-pip.txt
     -r{toxinidir}/requirements.txt
     -r{toxinidir}/misc/requirements/requirements-cxfreeze.txt
 commands =
@@ -180,7 +174,6 @@ commands =
 [testenv:pyinstaller]
 basepython = python3
 deps =
-    -r{toxinidir}/misc/requirements/requirements-pip.txt
     -r{toxinidir}/requirements.txt
     -r{toxinidir}/misc/requirements/requirements-pyinstaller.txt
 commands =