setup: don't use setuptools 34 - it has indirect conflicts with the celery version supported on the stable branch (Issue #266)

Setuptools==34 requires packaging>=16.8 which has an unconstrained requirement
of pyparsing ... but actually it doesn't work with pyparsing==1.5.7 ... which
is required by celery<2.3 ... which this version of Kallithea requires.

Celery has been upgraded on the development branch but we don't want to do that
on the stable branch.

docs/contributing.rst

@@ -34,7 +34,7 b' To get started with development::'
         cd kallithea
         virtualenv ../kallithea-venv
         source ../kallithea-venv/bin/activate
-        pip install --upgrade pip setuptools
+        pip install --upgrade pip "setuptools<34"
         pip install -e .
         paster make-config Kallithea my.ini
         paster setup-db my.ini --user=user --email=[e-mail] --password=password --repos=/tmp

docs/installation.rst

@@ -39,7 +39,7 b' repository, follow the instructions belo'
         cd kallithea
         virtualenv ../kallithea-venv
         source ../kallithea-venv/bin/activate
-        pip install --upgrade pip setuptools
+        pip install --upgrade pip "setuptools<34"
         pip install -e .
         python2 setup.py compile_catalog   # for translation of the UI
 
@@ -69,7 +69,7 b' An additional benefit of virtualenv_ is '
   basic requirements are up-to-date by running::
 
     source /srv/kallithea/venv/bin/activate
-    pip install --upgrade pip setuptools
+    pip install --upgrade pip "setuptools<34"
 
 .. note:: You can't use UNIX ``sudo`` to source the ``virtualenv`` script; it
    will "activate" a shell that terminates immediately. It is also perfectly

docs/installation_win.rst

@@ -134,7 +134,7 b' In a command prompt type (adapting paths'
 
   cd C:\Kallithea\Env\Scripts
   activate
-  pip install --upgrade pip setuptools
+  pip install --upgrade pip "setuptools<34"
 
 The prompt will change into "(Env) C:\\Kallithea\\Env\\Scripts" or similar
 (depending of your folder structure). Then type::

docs/installation_win_old.rst

@@ -183,7 +183,7 b' In that CMD (loaded with VS2008 PATHs) t'
 
   cd C:\Kallithea\Env\Scripts (or similar)
   activate
-  pip install --upgrade pip setuptools
+  pip install --upgrade pip "setuptools<34"
 
 The prompt will change into "(Env) C:\\Kallithea\\Env\\Scripts" or similar
 (depending of your folder structure). Then type::

setup.py

@@ -35,6 +35,7 b" callback = lambda V: ('.'.join(map(str, "
 is_windows = __platform__ in ['Windows']
 
 requirements = [
+    "setuptools<34", # setuptools==34 has an undeclared requirement of pyparsing >=2.1, but celery<2.3 requires pyparsing<2
     "waitress==0.8.8",
     "webob>=1.0.8,<=1.1.1",
     "webtest==1.4.3",