Place package metadata directly in .el files

In the case of single-file packages like this, a -pkg.el is unnecessary.

This commit therefore removes the -pkg.el files and puts the info
directly in the .el files. It also, therefore, adjusts the formatting of
those files slightly in order to be readable by `package-buffer-info`.
Merge pull request #1 from purcell/packaging

Place package metadata directly in .el files