Fix Javascript errors in taggit-autosuggest

Fix CSS and JS file path, define django.jQuery required for autosuggest.
Use my clone of django-taggit-autosuggest for the updated js
Fix jquery.js inclusion to be in the header instead of footer

Otherwise calls to jQuery inside the HTML cannot work because jQuery is not included yet.
Merge pull request #450 from danielhers/autosuggest

Finally fix Taggit AutoSuggest