Update `bin/badge-update.py`

Thanks to @gvwilson to the comments.

Fixes:

* Check if the badges had been update previously.
Create pages for criteria for earning badges

The list of people reward with badges was moved from `badges/index.html`
to `badges/name-of-the-badge.html`.

TODO: The criteria for earning the achievement wasn't write yet.
Add `badgebakery.py`

`badgebakery.py` was written by toolness and make available at
https://gist.github.com/toolness/5326379.

The link to `badgebakery.py` was found at
https://github.com/mozilla/openbadges/wiki/Badge-Baking.
Import badgebakery in badge-update.py

* Add flag in badge-update.py to bake the badge.
* Improve the flags.
* Import the badgebakery that are use to bake the badge.
Update the creating of badges

* The creation of badges are now delivery by `bin/badge-create.py`
  and compatible with v1.0.0
* `bin/badge.py` store definitions useful for `bin/badge-create.py`
  and `bin/badge-update.py`
* Add information about badges in `README-badge.md`
Merge branch 'updating-badging' of github.com:r-gaia-cs/site into updating-badging
Changes base on @gvwilson comments

* Avoid duplicate lines in HTML pages with layout and CSS
* Avoid import inside functions
* Warning user that the badge already in version 1.0.0
* Fix typo: backing => baking
* Avoid dict.key()
* Add words about Anaconda
Update all badges to version 1.0.0

Just run

    $ python bin/badge-update.py -w \
    badges/creator/* badges/instructor/* \
    badges/organizer/*
Remove old CSS from `badges/index.html`
Add core and helper

Add needed files for Core and Helper badges version 1.0.0.
Merge branch 'updating-badging' of github.com:r-gaia-cs/site into updating-badging
Changing wording of badges index page
Tidying up the text for the new badges, and the Makefile that rebuilds them