Adding pip_clean script

CONTRIBUTING.rst

@@ -1,6 +1,6 @@
------------------------
+----------------------
-Contributor Guidlines
+Contributor Guidelines
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+----------------------
 
 Before you start
 ================

scripts/pip_clean.sh

@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+# Removes any lingering build/release files from the project directory
+
+find . -type f -name '*.pyc' -delete
+find . -type f -name '*.pyo' -delete
+find . -type d -name '__pycache__' -delete
+find . -type d -name 'build' -delete
+find . -type d -name 'dist' -delete
+find . -type d -name '*.egg-info' -delete