Added a simple text file to record last download

The file sits in the same location as the downloaded files. It is a
text file where the first line is a date time string specifying when
the last dataset was downloaded. The methods added are
get_local_metadata and set_local_metadata.

The prompt was also changed to give information to the user.
Removed Unnecessary Variable
Merge branch 'master' of github.com:anabranch/django-calaccess-raw-data into anabranch-master
PEP8 fixes
Refactored how the prompt is put together so that is uses a Django template.
Added MANIFEST.in file to try to get the new templates directory into the package
PyFlakes fix
Removed crufty import
Merge branch 'anabranch-master'