Add .dir-locals.el and _CoqProject files for emacs stdlib editing

These set up PG to use the local coqtop, and the local coqlib, when
editing files in the stdlib.  As per
https://github.com/coq/coq/pull/386#issuecomment-279012238, we can use
`_CoqProject` for `theories/Init`, and this allows CoqIDE to edit those
files.  However, we cannot use it for `theories/`, because a
`_CoqProject` file will override a `.dir-locals.el` in the same
directory, and there is no way to get PG to pick up a valid `-coqlib`
from `_CoqProject` (because it'll take the path relative to the current
directory, not relative to the directory of `_CoqProject`).

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