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

hacking/README

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+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

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+# -*- 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