Add environment updating script 'env-setup' to facilitate running ansible from a git checkout.

.gitignore

-*~
 *.py[co]
 build
+# Emacs backup files...
+*~
+.\#*

docs/man/.gitignore

 *.xml
+*.[0-9]

hacking/README

+The 'env-setup' script modifies your environment to allow you to run
+ansible from a git checkout.
+
+To use it from the root of a checkout:
+
+    $ . ./hacking/env-setup
+
+Note the space between the '.' and the './'
+
+Man pages will not load until you run 'make docs' from the root of the
+checkout.

hacking/env-setup

+# -*- mode: shell-script -*-
+PREFIX_PYTHONPATH="`pwd`/lib/ansible:`pwd`/lib"
+PREFIX_PATH="`pwd`/bin"
+PREFIX_MANPATH="`pwd`/docs/man"
+
+echo "Prefixing PYTHONPATH with $PREFIX_PYTHONPATH"
+export PYTHONPATH=$PREFIX_PYTHONPATH:$PYTHONPATH
+echo "Prefixing PATH with $PREFIX_PATH"
+export PATH=$PREFIX_PATH:$PATH
+echo "Prefixing MANPATH with $PREFIX_MANPATH"
+export MANPATH=$PREFIX_MANPATH:$MANPATH