Start to isolate the list of packages. Also we want to define packages
function at the top level of an elisp file in order to not prevent
emacs from knowing where the functions are defined.
This commit has a POC made with elfeed and elixir layers.
Since https://github.com/tonini/alchemist.el/commit/395e6717
calling `alchemist-iex-reload-module` reloads the module in
the current buffer via `r(Module)`
(Also my first contribution to spacemacs, hope I'm holding it right)
Update Readme to reflect changes to packages.el
Helm seems to treat "!" specially in pattern matching, so having a ! in
the pattern string when traversing directories is problematic. This
change fixes#2737, because as far as I can tell "+" has no special
meaning in a helm pattern.
Of course, we can choose a different character, but I'm fond of "+" as
representing "more layers here".
