[Lint] Add pre-commit config

- Added a pre-commit config for code linting and formatting. It will
  auto-format python, javascript, CSS, YAML and markdown files to save
  manually doing so. To install:

      pip install pre-commit
      pre-commit install

- Added a default virtual environment directory to gitignore.

1 files changed, 2 insertions, 2 deletions

diff --git a/setup.cfg b/setup.cfg
index 4809e64b5..822958602 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -23,8 +23,8 @@ known_third_party =
     bbfreeze, win32verstamp,
 # Ignore gtk modules, primarily for tox testing.
     pygtk, gtk, gobject, gtk.gdk, pango, cairo, pangocairo,
-# Ignore sphinx dependencies.
-    recommonmark,
+# Ignore other module dependencies for pre-commit isort.
+    twisted, OpenSSL, pytest, recommonmark, chardet, pkg_resources, zope, mock
 known_first_party = msgfmt, deluge
 order_by_type = true
 not_skip = __init__.py