emacs: User configuration & loading

Users can now use the Gerrit Repo extension by requiring the modules
and doing minimal configuration.

BUG=chromium:1111775
TEST=Loaded using test Emacs init.el and tested gerrit-comments interface.

Change-Id: I8b45017b272cbaf3ca29be096437c8d637203674
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/2331862
Reviewed-by: Jack Rosenthal <jrosenth@chromium.org>
Reviewed-by: Sean McAllister <smcallis@google.com>
Tested-by: Aaron Massey <aaronmassey@chromium.org>
Commit-Queue: Aaron Massey <aaronmassey@chromium.org>
2 files changed