Patch updates for pinned python packages

python-package-update.sh

# Use sed to replace '==x.y' with '<x.y.999'
# and save results to a file
sed -r -e "s/==([0-9]+\.[0-9]+)(\..+)?/<\1.999/" requirements.txt > /tmp/requirements2.txt

# It works by transforming the file like this:
# Django==1.4.8        >>  Django<1.4.999
# Jinja2==2.5          >>  Jinja2<2.5.999
# M2Crypto==0.19.1     >>  M2Crypto<0.19.999
# MySQL-python==1.2.5  >>  MySQL-python<1.2.999
# Pillow==2.5.1        >>  Pillow<2.5.999

# Use pip with --upgrade and feed in the results
pip install --upgrade -r /tmp/requirements2.txt

# Compare updated environment with existing requirements.txt
pip freeze | diff - requirements.txt