Use pip to install psycopg2 instead of symlinking
Don't worry if `cp -n` fails

Exit code is 1 on some versions of cp if the file was not copied. We
don't really care, so capture the return value.
Test if settings file exists instead of `cp -n`
Require fabric to be run globally; add success msg
Remove deployment-specific fabfile commands

Will move them to a separate repository.
Change PATH settings around a bit.

Now, STORAGE_PATH can be set to change where files created by django are
stored. It needn't be  the same as the project path and can be changed
with a single setting.
Merge branch 'improved-setup' into django-compressor