setup.py: Remove explicit psutil requirement

psutil may not always be available and we check for this at import time
already

Closes #280

doc/changelog.rst

@@ -11,6 +11,7 @@ Unreleased
 
 * Fixed: ``--output-document`` file doesn't contain content.
 * Fixed: OverflowError when URL contains invalid port number greater than 65535 or less than 0.
+* Changed: The setup file no longer requires optional psutil.
 
 
 1.2.1 (2015-05-15)

doc/install.rst

@@ -24,6 +24,7 @@ Wpull requires the following:
 
 The following are optional:
 
+* `psutil` for monitoring disk space
 * `Lunatic Python (bastibe version)
   <https://github.com/bastibe/lunatic-python>`_ for Lua support
 * `Manhole <https://pypi.python.org/pypi/manhole>`_ for a REPL debugging socket
@@ -72,6 +73,14 @@ Install Wpull from GitHub::
    as the path will install Wpull's develop branch.
 
 
+psutil
+++++++
+
+psutil is required for the disk and memory monitoring options but may not be available. To install::
+
+    pip3 install psutil
+
+
 Pre-built Binaries
 ==================
 

setup.py

@@ -89,7 +89,7 @@ def get_version():
 
 setup_kwargs['install_requires'] = [
     'tornado', 'trollius', 'chardet', 'sqlalchemy',
-    'namedlist', 'html5lib', 'dnspython3', 'psutil'
+    'namedlist', 'html5lib', 'dnspython3',
 ]
 
 setup_kwargs['scripts'] = ['scripts/wpull', 'scripts/wpull3']