Updated version to 0.9.0

#16 Added genattrib.py which allows a user to generate an attribution
file from a directory, and #47 optionally a sublist of components for a
given set of .ABOUT files

#16 Modified the default.html attribution template

#16 Added license_text() to about.py which checks if the license text
file field exists and the file exists and it returns the text of the
license