Remove redundant bits from TG

Some left over CSS from the old Turbogears implementation
Fix Pillow version

Latest Pillow is 2.4 and API is compatible with Ratbot, so we need to
permit its inclusion
Missing copyright in file header
FilesThread needs to be a daemon thread

The FilesThread shouldn't be able to hold the application hostage on
shutdown - if a file isn't deleted this time we can always delete it
next time...
Fix links in README
Remove redundant code

Remove the commented out bits of redundant code