Support diary files

[JonathanReeve]

It'd be great to have an option to sync with Emacs diary files instead of Org files. The difference in syntax is drastic:

Org:

* My Event
  :PROPERTIES: 
  :ID: 0980237572735723
  :END: 

<2017-04-02 Thu 17:00>

Diary:

2 April 2017 17:00 My Event

Diary entries are just so much nicer and easier to read. It's much easier to get an overview of a week using them, and they're much easier to edit.

[telotortium]

Hi everyone! This repository is obsolete - the actively developed fork is now https://github.com/kidd/org-gcal.el, which is also the "org-gcal.el" on MELPA (see #115). I'm one of the maintainers of https://github.com/kidd/org-gcal.el. I can't directly close issues or PRs on this repo, but please download https://github.com/kidd/org-gcal.el and see if your issue or PR is still applicable. If so, open an issue or PR on https://github.com/kidd/org-gcal.el. In any case, you should close your issue or PR in this repo.