Remove el-get submodule
Ignore el-get directory

init.el will now pull down and install el-get itself if necessary.
So el-get-self-update _should_ work now.
Overhaul el-get setup

 * Uses the snippet in the README to self-install el-get when missing.
 * Leans on package.el for packages without el-get recipes.
 * Use separate initialization files for packages.
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