el-get.rcp: use :features instead of :load

When reloading el-get, doing :load "el-get.el" causes only the new el-get.el
file to be loaded, resulting in a "hybrid" in which we have new versions
of the el-get.el functions and old versions of all the others. The later
call to el-get-reload takes care of this anyway.

recipes/el-get.rcp

@@ -6,7 +6,7 @@
        :pkgname "dimitri/el-get"
        :info    "."
        :compile ("el-get.*\\.el$" "methods/")
-       :load    "el-get.el"
+       :features el-get
        :post-init (when (memq 'el-get (bound-and-true-p package-activated-list))
                     (message "Deleting melpa bootstrap el-get")
                     (unless package--initialized