Copy the .vimrc last

It references the color scheme norwaytoday, which was only copied
at a later step. In case the script failed in between, the configuration
would be inconsistent.
Configure external location ~/.vim/swap for swap files

This avoids cluttering working directories with temporary files,
and prevents from adding these files to repositories of Version
Control Systems (e.g. git) by mistake.
Add title and URL to identify the project of origin in .vimrc