Don't include recipes in el-get package

The el-get installer works by bootstrapping from melpa installed code so
only the el-get recipe is needed. Because Emacs insists on listing every
single file when extracting from a tar file, including the recipes makes
the initial install quite a bit slower.
Merge pull request #2127 from npostavs/el-get-norcp

Don't include recipes in el-get package