It knows argument to eval-after-load is code, and that #' implies
existence of a function.
Some of the package.el functions have changed, but that will be dealt
with separately.
This includes teaching methods that they now work with a symbolp PACKAGE,
some more cleaning up, and some load-path adjustments now that a part of the
code is in a subdirectory (methods).
Also include some of the tests used to convince oneself that the refactoring
didn't break any and all use cases for el-get, with some rough documentation
about how to use them.
